Transports, Imperial Japanese Navy, World War II

The format for names is Japanese style: rank; last name, first name; Japanese name in Kaji; (and in brackets the officer's graduating class of the Naval Academy at Etajima, if applicable). (M) Behind the name indicates a merchant marine (civilian) officer. Rank as was at the date he took command, whether as supervisor or captain. If an officer is shown as being in command before the ship was commissioned, he was Chief Equipping Officer, becoming Commanding Officer on the date the ship was commissioned. Dates are given thus: day.month.year Commanders marked with * are known to have died.
Akashisan Maru 明石山丸ンサシカア		AP
Type: Transport
Builder: Mitsui Engineering & Shipbuilding, Tamano
Owner: Mitsui Bussan
Call Sign: JGEJ
Official Number: 40698
Laid Down:		15.11.1934
Launched:		20.04.1935
Completed as passenger liner/cargo ship (4,541 GRT):		03.06.1935
Service:
Civilian, Mitsui Line		03.06.35–20.09.41
Chartered by Navy		16.09.1941
Converted to navy auxiliary		16.09.51–21.10.41
Maizuru ND		20.09.41–11.41
5th Fleet		11.41–
Requisitioned by Navy		25.04.1943
?		25.04.43–10.05.44
Fate: Sunk, 03.03.44 by USS Sandlance (SS-381) about 21 nm west of Uruppu Island, Kuriles (46°00'N ,149.08'E). 45 dead; 0 saved.
Removed from Navy List:		10.05.1944
Commanding Officers:
Capt Hosoya Yoshio (36)	細谷義男	16.09.41–12.11.42
Capt Takeuchi Heisichi (41)	竹内平七	12.11.42–27.03.43
*Capt Fukuzawa Tetsushiro (36)	福沢哲四郎	27.03.43–02.03.44
Akibasan Maru 秋葉山丸ンサバキア		AP
Type: Transport
Builder: Mitsui Engineering & Shipbuilding, Tamano
Owner: Mitsui Bussan
Call Sign: JYZA
Official Number: 30502
Laid Down:		11.03.2024
Launched:		10.09.2024
Completed as cargo ship (4,603 GRT):		18.11.2024
Service:
Civilian, Mitsui Line		18.11.24–07.41
Chartered by IJN		07.41–29.08.41
Civilian, Mitsui Line		29.08.41–20.11.41
Chartered by IJN		13.11.1941
Yokosuka ND		20.11.41–30.01.44
4th Fleet		22,04.42–10.03.44
Fate: Sunk 30.01.44 by USS Burns (DD-588) SW of Ujae Atoll (09°24'N, 157°45'E). 53 dead; ? saved.
Removed from Navy List:		10.03.1944
Commanding Officers:
?		?
Amagisan Maru 天城山丸ンサギマア		AF
Type: Refrigerated Transport
Builder: Mitsui Engineering & Shipbuilding, Tamano
Owner: Mitsui Bussan
Call Sign: JUSI
Official Number: 38579
Laid Down:		22.12.1932
Launched:		06.11.1933
Completed refrigerated cargo ship (7,620 GRT):		26.12.1933
Service:
Civilian, Mitsui Line		26.12.33–05.10.41
Chartered by IJN		05.10.1941
Maizuru. Converted to navy auxiliary		05.10.41–13.11.41
Supply Unit, 11th Air Fleet		13.11.41–01.10.42
SE Area Fleet		01.10.42–01.02.44
Requisitioned. Maizuru ND		01.02.44–21.03.44
Fate: Sunk 17.02.44 by aircraft from USS Bunker Hill (CV-17), TF 58, at Truk (07°18'N, 151°35'E). 3 dead; ? saved.
Removed from Navy List:		21.03.1944
Commanding Officers:
Capt Suzuki Matayoshi		05.10.41–09.43
Capt Kurosaka (M)		09.43–
Cdr Nakagome Ikuzou (36)	中込育三	05.10.41–15.02.43
Capt Sato Bunkichi (36)	佐藤文吉	15.02.43–11.43
Anan Maru 亜南丸		AP
Type: Coaster
Builder: Scheepswerf Gebr. v/d Werf, Deest, Netherlands
Call Sign: JWNY
Official Number: n/a
Laid Down:		?
Launched:		01.09.1938
Completed as Passenger liner/cargo ship as S/S Enitown (795 GRT)
Service:
Civilian, Comben Longstaff & Co. London, England as S/S Enitown		01.09.1938
Civilian, Manila Steamship Co., Manila as S/S Anakan		21.04.1905
Scuttled in Manila harbor		01.12.1941
Refloated and repaired by IJN		14.04.42–
Renamed Anan Maru		01.01.1943
?		01.01.43–
Fate: Surrendered. Returned to owners as S/S Anakan. Redesignated 1948 as S/S Regulus. Sunk in typhoon 02.11.49 near San Jose, Antique, Philippine.
Removed from Navy List:		03.05.1947
Commanding Officers:
?		?
Argentina Maru あるぜんちな丸アルゼンチナ		AP
Type: Transport
Builder: Mitsubishi Heavy Industries, Nagasaki Dockyard
Owner: Osaka Merchant Marine Co.
Call Sign: JPJM
Official Number: 45771
Laid Down:		05.02.1938
Launched:		09.12.1938
Completed passenger liner (12,759 GRT):		31.05.1939
Service:
Civilian, OSK Line		31.05.39–01.05.41
Chartered as transport by IJN		01.05.41–09.12.42
Sold to IJN		09.12.1942
Fate: Converted to aircraft carrier Kaiyo		10.12.42–23.11.43
Commanding Officers:
Cdr Watanabe Takeshi (34)	渡部　威	01.05.42–23.11.43
Asahisan Maru 朝日山丸ンサヒサア		AP
Type: Transport
Builder: Mitsui Engineering & Shipbuilding, Tamano
Owner: Mitsui Bussan
Call Sign: JGAJ
Official Number: 40205
Laid Down:		10.10.1934
Launched:		23.03.1935
Completed passenger liner/cargo ship (4,550 GRT):		30.04.1935
Service:
Civilian, OSK Line		30.04.35–20.12.41
Requisitioned		18.12.1941
Yokosuka ND		20.12.41–10.09.44
Fate: Sunk 27.07.44 by aircraft from USAAF 5th Air Force in Kau Bay, Halmahera, Moluccas (01°00'N, 127°54'E). 2 dead; ? saved.
Removed from Navy List:		10.09.1944
Commanding Officers:
?		?
Azuma Maru 吾妻丸		AP
Type: Transport
Builder: Mitsubishi Heavy Industries, Nagasaki Dockyard
Owner: Nippon Yusen
Call Sign: JWZL
Official Number: 44403
Laid Down:		03.05.1937
Launched:		23.10.1937
Completed as passenger liner/cargo ship (6,645 GRT):		10.03.1938
Service:
Civilian, NYK Line		10.03.38–10.04.42
Requisitioned		10.04.1942
Kure ND		10.04.42–15.02.43
Reclassified as tanker		15.02.1943
Kure ND		15.02.43–05.02.44
Fate: Sunk 03.12.43 by USS Tinosa (SS-283) NW of Sonserol, Palau (06°34'N, 131°35'E). 68 dead; ? saved.
Removed from Navy List:		05.02.1944
Commanding Officers:
*Capt Ara Tadashi (33)	荒　　糺	15.02.43–03.12.43
Azumasan Maru 吾妻山丸ンサマヅ		AP
Type: Transport
Builder: Mitsui Engineering & Shipbuilding, Tamano
Owner: Mitsui Bussan
Call Sign: JPUH
Official Number: 38085
Laid Down:		18.11.1932
Launched:		28.05.1933
Completed as cargo ship (7,622 GRT):		31.07.1933
Service:
Civilian, Mitsui Line		31.07.33–20.11.41
Requisitioned		20.11.1941
Converted to navy auxiliary		15.10.41–12.12.41
Mizuru ND		20.11.41–23.05.42
2nd Fleet		23.05.42–06.42
4th Fleet		06.42–01.02.43
Fate: Sunk 14.10.42 by aircraft from USS Enterprise (CV-6) off Guadalcanal (09°21'S, 159°52'E). ? dead; ? saved.
Removed from Navy List:		01.02.1943
Commnding Officers:
Capt Toyama Hikozi (34)	遠山彦次	20.11.41–01.06.42
Cdr Yamagami Seiichi (38)	山上誠一	01.06.42–04.10.42
Brazil Maru ぶら志る丸		AP
Type: Transport
Builder: Mitsubishi Heavy Industries, Nagasaki Dockyard
Owner: Osaka Shoen
Call Sign: JCZN
Official Number: 46463
Laid Down:		31.10.1938
Launched:		02.08.1939
Completed as Cargo ship (12,752 GRT):		03.12.1939
Service:
Civilian, Osaka Shoen
Requisitioned		04.09.1941
Yokosuka ND		04.09.41–01.08.42
Combined Fleet		01.08.42–15.09.42
Fate: Sunk 05.08.42 by USS Greening (SS-213) some 130 nm NW of Truk (09°51'N, 150°46'E). 57+ dead; ? saved.
Removed from Navy List:		15.09.1942
Commanding Officers:
Cdr [?] (35)	神通久次郎	01.05.42–05.08.42
Chihaya Maru 千早丸ヤハチ		AP
Type: Transport
Builder: Nederlandsche Scheepsbouw Mij., Amsterdam, Netherlands
Owner: Java-China-Japan Line (JCJL), Amsterdam/Batavia, Java
Call Sign: JWBY
Official Number: —
Laid Down:		?
Launched as cargo ship S/S Tjikalong:		06.06.1925
Completed as cargo ship/passenger liner S/S Tjisaroea (7,089 GRT)		15.01.1926
Service:
Civilian, JCJL as S/S Tjisaroea		15.01.26–04.03.42
Captured by destroyers Arishi and Nowake (DesDiv 4)		04.03.1942
Commissioned by IJN as transport as Chihaya Maru		20.08.1942
?		20.08.42–05.01.44
Fate: Sunk 02.11.43 by USS Seahorse (SS-304) in the Bingo Strait, East China Sea, 600 nm S of Yokohama (28°37'N,134°47'E).
Removed from Navy List:		05.01.1944
Commanding Officers:
Civilian, Capt J.J. van Nuys		–04.03.42
Capt Koyama Yoshiro (34)	小山与四郎	20.08.42–10.10.43
Capt Okamoto [?] (37)	岡本　絢	10.10.43–12.11.43
Choi Maru 明昭丸		AP
Type: Transport
Builder: Kawakami Heavy Industries, Kobe
Owner: Taiko Steamship Co.
Call Sign: JBTR
Official Number: 49846
Laid Down:
Launched:		01.12.1942
Completed as cargo ship (1,074 GRT):		20.02.1943
Civilian, Taiko S/S Co.		20.02.43–01.01.44
Requisitioned:		01.01.1944
?		01.01.44–10.09.44
Fate: Sunk 12.05.44 by USS Rasher (SS-269) in the Molucca Sea, NW of Boeroe Island (03°30'S, 126°06'E).
Removed from Navy List:		10.09.1944
Commanding Officers:
?		?
Choko Maru 長江丸ウコウチョ		AP
Type: Transport
Builder: Tama Dockyard
Owner: Taiyo Kogyo
Call Sign: JHJN
Official Number: 46376
Laid Down:		06.02.1939
Launched:		01.06.1939
Completed as cargo ship (3,515 GRT):		30.11.1939
Service:
Civilian, Mitsui Bussan		30.11.39–19.07.41
Requisitioned		19.07.1941
Yokosuka ND		09.09.41–20.09.41
Kure ND		20.09.41–05.02.44
Kure. Conversion to Navy transport		20.09.41–14.10.41
Fate: Sunk 06.12.43 at 04:37 by aircraft from USS Lexington (CV-16) and USS Independence (CVL-22), of the US Navy TF 51 at Kwajalein Atoll, Marshall Islands, about 2 nm WSW of Bustard Island (08°45'N, 167°44'E). 4 dead; ? saved.
Removed from Navy List:		05.02.1944
Commanding Officers:
?		?
Chowa Maru 長和丸ワチョ		AP
Type: Transport
Builder: Osaka Iron Works, Sakurajima
Owner: Nitto Kogyo Steamship; Tokyo
Call Sign: JWJN
Official Number: 46802
Laid Down:		22.04.1905
Launched:		02.11.1939
Completed cargo ship (2,719 GRT):		19.02.1940
Service:
Civilian, Nitto Kogyo Steamship		19.02.40–09.11.41
Chartered by Navy		09.11.1941
Converted to navy auxiliary		14.11.41–30.11.41
Sasebo ND		20.11.41–10.06.44
Ominato Guard District		10.06.44–01.05.45
Fate: Sunk 01.05.45 at 04:48 by USS Bowfin (SS-287) 54 nm SE Hokkaido (41°02'N, 144°56'E). 41 dead; ? saved.
Removed from Navy List:		10.06.1945
Commanding Officers:
?		?
Chuwa Maru 中和丸ワチュ		AP
Type: Transport
Builder: Osaka Iron Works, Osaka
Owner: Nitto Kogyo Steamship Co.
Call Sign: JWZN
Official Number: 46812
Laid Down:
Launched:		30.11.1939
Completed as cargo ship (2,719 GRT):		18.03.1940
Service:
Civilian, Nitto Kogyo Steamship		18.03.40–05.09.41
Requisitioned		05.09.1941
Converted to navy auxiliary		20.09.41–01.10.41
Sasebo ND		20.09.41–11.41
Mako Guard District		11.41–
Fate: Sunk 10.02.42 at 17:25 by USS Trout (SS-202) 25 nm E of Kirun (25°23'N, 122°42'E). 0 dead; ?saved.
Removed from Navy List:		01.04.1942
Commanding Officers:
?		?
Cuba Maru 玖馬丸		AP
Type: Transport
Builder: Kawasaki Dockyard
Owner: Kawasaki Steamship Co.
Call Sign: JHUB
Official Number: 31741
Laid Down:		22.04.2025
Launched:		29.04.2026
Completed as passenger/cargo ship (5,950 GRT):		25.08.1936
Service:
Civilian, Kawasaki S/S Co.		25.08.36–20.09.41
Requisitioned		20.09.1941
Yokosuka ND		20.09.41–20.04.43
Fate: Wrecked 25.08.42 some 13 nm E of Odomari Bay, Karafuto (46°23'N, 143°37'E). ? dead; ? saved.
Removed from Navy List:		20.04.1943
Commanding Officers:
?		?
Daicho Maru 大朝丸		AP
Type: Transport
Builder: Horai Heavy Industries Tekko
Owner: Daicho Steamship Co.
Call Sign: JRKR
Official Number: 49560
Laid Down:		?
Launched:		01.07.1942
Completed as cargo ship (1,135 GRT):		01.11.1942
Service:
Civilian, Daicho S/S Co.		01.11.42–01.01.44
Requisitioned		01.01.1944
?		01.01.44–05.02.45
Fate: Sunk 27.12.44 by accidental bomb explosion off Batavia, Java (06°06'S, 106°53'E).
Removed from Navy List:		05.02.1945
Commanding Officers:
?		?
Eiko Maru No. 2 第2永興丸ウコイエ		AP
Type: Transport
Builder: Tama Dockyard
Owner: Taiyo Kogyo
Call Sign: JSIO
Official Number: 47587
Laid Down:		10.04.1940
Launched:		20.09.1940
Completed as cargo ship (3,935 GRT):		20.12.1940
Service:
Civilian, Mitsui Bussan		20.12.40–31.10.41
Requisitioned		31.10.1941
Kure. Converted to navy auxiliary		31.10.41–22.11.41
Kure ND		10.11.41–03.05.44
Fate: Sunk 30.01.44 by USS North Carolina (BB-55) off Roi-Namur (09°10'N, 167°20'E). 46 dead; 0 saved.
Removed from Navy List:		03.05.1947
Commanding Officers:
?		?
Goyo Maru 五洋丸		AP
Type: Transport
Builder: Kawasaki Dockyard
Owner: Goyo Merchant Marine Co.
Call Sign: JXSM
Official Number: 45331
Laid Down:		02.03.1938
Launched:		25.08.1938
Completed as cargo ship (8,469 GRT):		17.04.1939
Service:
Civilian, Goyo Merchant Marine Co.		17.04.39–16.10.41
Requisitioned		16.10.1941
Combined Fleet		16.10.41–25.08.42
Civilian, Goyo Merchant Marine Co.		25.08.42–03.02.44
Fate: Sunk 03.02.44 by USS Tambor (SS-198) 200 nm SE Shanghai (28°44'N, 123°38). 18 dead; ? saved.
Commanding Officers:
Capt Imaizumi [?] (34)	今泉美啓	20.11.41–
Hakonesan Maru 箱根山丸ンサネコハ		AF
Type: Refrigerated Transport
Builder: Mitsui Bussan, Zosembu Tama Kojo
Owner: Mitsui Bussan
Call Sign: JDUC
Official Number: 34431
Laid Down:		25.07.2028
Launched:		14.03.2029
Completed as refrigerated cargo ship (6,673 GRT):		29.05.2029
Service:
Civilian, Mitsui Bussan		29.05.29–08.36
Civilian, OSK Line		08.36–15.10.41
Chartered by Navy		03.06.38–15.10.41
Requisitioned		15.10.1941
Yokosuka ND		15.10.41–15.11.42
Fate: Sunk 18.10.42 at 03:40 by USS Greenling (SS-213) 15 nm E of Haramachi (37°35'N, 141°30'E). 14 dead; ? saved.
Removed from Navy List:		15.11.1942
Commanding Officers:
Capt Yoshida Eisuke		1938–23.05.40
?		23.05.40–
Hakutetsu Maru No.7 第7博鉄丸ツテクハ		AC
Type: Cargo ship, but used throughout her career as a collier.
Builder: Namura Dockyard, Osaka
Owner: Hakatawan Tetsudo Steamship
Call Sign: JMFK
Official Number: 41804
Laid Down:		01.02.1936
Launched:		01.05.1936
Completed as cargo ship (1,018 GRT):		01.07.1936
Service:
Civilian, Hakatawan Tetsudo Steamship
Chartered by IJN		20.03.42–10.04.42
Requisitioned		10.04.1942
Sasebo ND		10.04.42–10.11.44
Fate: Sunk 12.09.44 by USS Pipefish (SS-388) about 3 nm E of Kashinozaki (33°32'N, 135°55'E). 10 dead; ? saved.
Removed from Navy List:		10.11.1944
Commanding Officers:
?		?
Hakutetsu Maru No.15 第15博鉄丸ツテクハ		AC
Type: Cargo ship, but used throughout her career as a collier.
Builder: Osaka Dockyard, Osaka
Owner: Nishi Nippon Tetsudo
Call Sign: JBBQ
Official Number: 49012
Laid Down:		?
Launched:		01.07.1941
Completed as cargo ship (1,339 GRT)		?
Service:
Civilian, Nishi Nippon Tetsudo
Chartered by IJN		19.03.42–10.04.42
Requisitioned		10.04.1942
Sasebo Nval District		10.04.42–30.06.45
Fate: Damaged 03.06.45 by mine. Surrendered. Returned to owners 1945. Wrecked 27.12.55 in storm (40°34'N, 141°21E).
Removed from Navy List:		30.06.1945
Commanding Officers:
?		?
Heito Maru 屏東丸ウトイヘ		AP
Type: Transport
Builder: Mitsubishi Heavy Industry, Nagasaki
Owner: Osaka Merchant Marine Co.
Call Sign: JZDH
Official Number: 40872
Laid Down:		03.10.1934
Launched:		23.03.1935
Completed as passenger liner/cargo ship (4,468 GRT):		31.08.1935
Service:
Civilian, OSK Line		31.08.35–1937
Requisitioned by Army		1937–1941
Requisitioned by IJN		31.08.1941
Yokohama. Converted to navy auxiliary		06.09.41–08.10.41
Sasebo ND		20.09.41–01.11.43
Fate: Sunk 23.08.43 by aircraft of USAAF 7th Bomb Group (10th Air Force) at Car Nicobar Island, Andaman Sea (09°10'N, 92°50'E). 33 dead; ? saved.
Removed from Navy List:		01.11.1943
Commanding Officers:
Cdr Kawai [?] (36)	川合　信	20.09.41–10.09.42
Cdr Kashiwagi Tadashi (34)	柏木　質	10.09.42–23.08.43
Hikoshima Maru 彦島丸		AP
Type: Transport
Builder: Bingo Dock Co.
Owner: Torakichi Iino
Call Sign: JLGE
Official Number: 22808
Laid Down:		?
Launched:		01.06.2018
Completed as cargo ship (966 GRT):		?
Service:
Civilian, Torakichi Iino		06.18–01.01.44
Requisitioned		01.01.1944
?		01.01.44–03.05.47
Fate: Sunk 18.06.44 [?]
Removed from Navy List:		03.05.1947
Commanding Officers:
?		?
Hino Maru No. 3 第三日の丸		AP
Type: Transport
Builder: Mitsubishi Jukogyo, Kobe
Owner: Hinomaru Steamship
Call Sign: JCSM
Official Number: 44160
Laid Down:		06.07.1937
Launched:		04.11.1937
Completed as cargo ship (4,391 GRT):		25.03.1938
Service:
Civilian, Nihon Shokuen Kaiso		25.03.38–25.04.41
Chartered by IJN		25.04.41–15.10.41
Requisitioned by IJN		15.10.1941
Yokosuka ND		15.10.41–01.02.43
Fate: Sunk 07.12.42 by USS Kingfish (SS-234) ca. 135 nm WSW Minami-Iwo Jima (23°30'N, 13°20'E). 19 dead; ? saved.
Removed from Navy List:		01.02.1943
Commanding Officers:
?		?
Hino Maru No. 5		AP
Type: Transport
Builder: Mitsubishi Heavy Industry, Kobe
Owner: Hinomaru Steamship Co.
Call Sign: JJYO
Official Number: 47572
Laid Down:		21.01.1940
Launched:		24.07.1940
Completed as cargo ship (2,725 GRT):		30.10.1940
Service:
Civilian, Hinomaru Steamship Co.		30.10.40–16.11.41
Requisitioned		16.11.1941
Osaka. Converted to navy auxiliary		16.11.41–16.12.41
Maizuru ND		01.12.41–12.41
11th Air Fleet		12.41–01.03.42
SW Area Fleet		01.03.42–01.10.42
SE Area Fleet		01.10.42–01.12.43
Fate: Sunk 10.10.43 by aircraft of USAAF 13th Air Force 24 nm west of Buka (05°25'S, 154°17'E). ? dead; ? saved.
Removed from Navy List:		01.12.1943
Commanding Officers:
?		?
Hirota Maru		AP
Type: Transport
Builder: Hakodate Dock Co.
Owner: Nippon Yusen
Call Sign: JPUJ
Official Number: 47665
Laid Down:		23.04.1905
Launched:		04.06.1940
Completed as cargo ship (2,992 GRT):		07.10.1940
Service:
Civilian, NYK Line		07.10.40–07.12.41
Chartered by IJN		07.12.41–10.04.42
Requisitioned		10.04.1942
Sasebo ND		10.04.42–01.04.43
Mako Guard District		01.04.43–30.06.45
Chartered by Navy		30.06.45–14.08.45
Fate: Sunk 14.08.45 by mine laid by USAAF 20th Air Force 3 nm NNE of Mutsure-Jima, Honshu (34°00'N, 130°52'E). 8 dead; ? saved.
Removed from Navy List:		30.06.1945
Commanding Officers:
?		07.12.41–24.03.44
Resv Capt Ueno Tamejiro	?	24.03.44–14.08.45
Hiyoshi Maru 日吉丸シヨヒ		AP
Type: Transport
Builder: Kawasaki Dockyard, Kobe
Owner: Azuma Steamship Co.
Call Sign: JNIL
Official Number: 42939
Laid Down:		21.09.1936
Launched:		28.12.1936
Completed as cargo ship (4,046 GRT):		01.04.1937
Service:
Civilian, Azuma Steamship Co.		01.04.37–15.10.41
Chartered by Navy		03.05.41–15.10.41
Requisitioned by Navy		15.10.1941
Sasebo ND		15.10.41–31.03.44
Fate: Sunk 04.12.43 at 01:00 by USS Gunnel (SS-253) ca. 280 nm NE Chichi Jima (29°36'N, 145°54'E). 38 dead; ? saved.
Removed from Navy List:		31.03.1944
Commanding Officers:
?		?
Hoki Maru 伯耆丸		AP
Type: Transport
Builder: William Denny & Brothers Dumbarton, Scotland
Owner: Union Steam Ship Company (P&O) of New Zealand, Dunedin, New Zealand
Call Sign: JWIY
Official Number:
Laid Down:		?
Launched:		28.11.2021
Completed as passenger liner/cargo ship S/S Haruaki (7,112 GRT):		19.05.2022
Service:
Civilian, Union Line as S/S Haruaki		19.05.22–19.07.42
Captured by armed merchants cruisers Aikoku Maru and Hokoku Maru		19.07.1942
Refitted and commissioned as Hoki Maru		–31.12.42
?		31.12.42–31.03.44
Fate: Sunk 17.02.44 by aircraft of the USAAF at Truk, Carolines.
Removed from Navy List:		31.03.1944
Commanding Officers:
?		?
Hokkai Maru 北海丸イカッホ		AP
Type: Transport
Builder: Mitsubishi, Nagasaki
Owner: Osaka Merchant Marine Co.
Call Sign: JKVE
Official Number: 38123
Laid Down:		15.11.1931
Launched:		03.09.1932
Completed as cargo ship (8,416 GRT):		04.03.1933
Service:
Civilian, OSK Line		04.03.33–22.09.41
Requisitioned		22.09.1941
Yokosuka ND		10.11.41–16.09.44
Yokohama. Converted to navy auxiliary		02.10.41–20.11.41
Removed from Navy List after grounding		15.02.1942
Refloated and repaired		09.42–07.09.43
Civilian, Shipping Control Board		09.09.43–02.09.45
Fate: Badly damaged by mine 16.09.44, towed to Surabaya. Surrendered unrepaired. Seized 02.10.45 by Indonesian rebels. Sinks after fire 12.11.45.
Commanding Officers:
Capt Yamamura Minoru (37)	山村　實	?
Hokko Maru 豊光丸		AP
Type: Transport
Builder: Ropner & Sons Ltd., Stockton-On-Tees, England
Call Sign: ?
Official Number: ?
Laid Down:		?
Launched:		29.05.1907
Completed as cargo ship S/S Cardigan (4,295 GRT):		21.03.1905
Service:
Civilian, Cardigan Shipping Co., Cardiff, Wales as S/S Cardigan		1907–1915
Civilian, N.D. Lykiardopulo, Argostoli, Greece as S/S Athanasios		1915–1931
Civilian, Cephalonian Maritime Co., Piraeus, Greece as S/S Athanasios		1931–1938
Civilian, Kitagawa, Osaka, as Hokko Maru		1938–1944
Requisitioned		15.10.1941
?		15.10.41–10.05.44
Fate: Grounded and wrecked 20.03.1944 at Inubosaki, Honshu (35°42'N, 140°53'E).
Removed from Navy List:		10.05.1944
Commanding Officers:
?		?
Hokuhi Maru 北比丸		AP
Type: Transport
Builder: A. Vuijk, Capelle a/d IJssel, Netherlands
Call Sign: JWSY
Official Number:
Laid Down:
Launched:		07.05.1987
Completed as cargo ship S/S Inga (948 GRT)
Service:
Civilian, A/S D/S Inga (Meier), Kristiania, Norway		10.05.1904
Civilian, Inga Steamship Co., Sydney, Australia		05.10–04.11.26
Civilian, James Patrick & Co., Sydney, Australia		04.11.26–12.27
Civilian, W.R. Carpenter Co., Sydney, Australia		12.27–1930
Civilian, Madrigal & Co., Manila as S/S Cetus		1930–10.12.41
Scuttled in Manila		10.12.1941
Raised and repated. IJN as Hokuhi Maru		1942–01.01.43
Requisitioned		01.01.1943
?		01.01.43–10.05.45
Fate: Sunk, 02.03.45 by aircraft of USAAF 5th Air Force in Formosa Strait, off Mako, Pescadores (23°35'N, 119°35'E).
Removed from Navy List:		10.05.1945
Commanding Officers:
?		?
Hokuroku Maru 北陸丸キリク		AP
Type: Transport
Builder: Mitsubishi, Nagasaki
Owner: Osaka Shosen, Osaka
Call Sign: JJMC
Official Number: 36396
Laid Down:		24.02.1930
Launched:		09.09.1930
Completed cargo ship (8,359 GRT):		26.11.1930
Service:
Civilian, OSK Line		26.11.30–
Requisitioned		09.08.1941
Yokosuka ND		20.09.41–18.03.44
Conversion to navy auxiliary		23.09.41–10.10.41
Fate: Sunk 18.03.44 at 01:15 by USS Lapon (SS-26) 160 nm ESE of Hong Kong (19°24'N, 116°50'E). 88 dead; ? saved.
Removed from Navy List:		10.05.1944
Commanding Officers:
Capt Sakano Minbu (38)	坂野民部	20.09.41–10.10.41
Capt Tsukagoshi Hiotaro (39)	塚越彦太郎	10.10.41–05.09.42
Capt Nozawa Kinji (36)	野沢錦二	05.09.42–01.12.43
*Capt Itokawa Suetada (36)	糸川季忠	01.12.43–13.03.44
Hokusho Maru 北昭丸ウショクホ		AP
Type: Transport
Builder: Uraga Dock Co., Uraga
Owner: Kita Nippon Steamship Co.
Call Sign: JDYG
Official Number: 41737
Laid Down:		16.10.1936
Launched:		09.02.1937
Completed as cargo ship (4,211 GRT):		19.06.1937
Service:
Civilian, Kita Nippon S/S Co.		19.06.37–15.10.41
Requisitioned		15.10.1941
Yokusuka ND		15.10.41–01.11.43
Fate: Sunk 12.09.43 at 06:13 by USS Narwhal (SS-167) about 3 nm NW Nauru Island (00°28'S, 66°52'E). 32 dead; ? saved.
Removed from Navy List:		01.11.1943
Commanding Officers:
?		?
Kagu Maru 香久丸		AV / AP
Type: Transport
Aircraft Tail Code: 14-xx
Builder: Harima Dock Co., Aioi
Owner: Kokusai Steamship Co.
Call Sign: JHAL
Official Number: 41958
Laid Down:		21.11.1935
Launched:		18.04.1936
Completed as cargo ship (8,417 GRT):		30.06.1936
Service:
Civilian, Kokusai S/S Co.
Requisitioned		25.08.1937
Yokosuka. Converted to seaplane tender		25.08.37–18.09.37
3rd NAG; 3rd Fleet		18.09.37–20.10.37
3rd NAG; 4th Fleet		20.10.37–11.02.38
3rd NAG; 5th Fleet		11.02.38–15.12.38
Returned to owners		15.12.1938
Yokosuka. Converted to transport		15.12.38–16.01.39
Requisitioned		25.01.1939
Sasebo ND		25.01.39–20.04.39
Returned to owners:		20.04.1939
Requisitioned		10.11.1941
Sasebo ND		11.11.41–10.12.41
Sasebo Guard Force		10.12.41–10.01.45
Sasebo. Converted to navy auxiliary		11.11.41–24.11.41
Fate: Sunk 04.11.44 by USS Guitarro (SS-363), USS Ray (SS-271), and USS Bream (SS-243) ca. 10 nm NW Cape Bolinao, Luzon (15°54'N, 119°54'E). 46 dead; ? saved.
Removed from Navy List:		10.01.1945
Commanding Officers:
Capt Kira Shunichi (40)	吉良俊一	25.08.37–15.12.37
Capt Obayashi Sueo (43)	大林末雄	15.12.37–15.12.38
Capt Ito Yasunoshin (42)	伊藤安之進	15.01.39–28.01.39
Capt Kimura Masatomi (41)	木村昌福	28.01.39–20.04.39
?	?	20.04.39–31.10.41
Resv Lt(jg) Masuda Kinsaku	増田欣作	31.10.41–10.42
Resv Lt(jg) Maeda Kosaku	前田耕作	10.42–26.01.43
Capt Shiraishi Eitaro (M)	白石　榮太郎	26.01.43–
Kaihei Maru 海平丸イヘイカ		AP
Type: Transport
Builder: Mitsui Engineering & Shipbuilding, Tamano
Owner: Shimatani Steamship
Call Sign: JWQI
Official Number: 39711
Laid Down:		10.03.1934
Launched:		08.09.1934
Completed as cargo ship (4,575 GRT):		08.11.1934
Service:
Civilian, Shimatani Steamship		08.11.34–13.11.36
Civilian, OSK Line		13.11.36–
Requisitioned by Army		13.07.37–1938
Civilian, Shimatani Steamship		1938–09.05.41
Requisitioned by IJN		09.05.41–
Yokosuka ND		09.05.41–10.06.43
Fate: Sunk 15.04.43 at 18:56 by USS Seawolf (SS-197) ca. 160 nm south of Marcus Island (21°13'N, 152°24'E). 4 dead; ? saved.
Removed from Navy List:		10.06.1943
Commanding Officers:
?		?
Kaika Maru 海河丸カイカ		AP
Type: Transport
Builder: Dairen Dock Co., Dairen, Manchuria
Owner: Dairen Steamship Co., Dairen, Manchuria
Call Sign: JUIG
Official Number: K 930
Laid Down:		?
Launched:		01.11.1942
Completed as cargo ship (2,087 GRT):		24.04.1943
Service:
Civilian, Dairen Steamship Co.		24.04.43–01.01.44
Requisitioned		01.01.1944
?		01.01.44–10.03.44
Fate: Sunk 16.01.44 by USS Blackfish (SS-221) about 275 nm SW of Truk (03°50'N, 148°41'E).
Removed from Navy List:		10.03.1944
Commanding Officers:
Capt Kanbara Eiji (M)	蒲原榮次	–16.01.44
Kaiko Maru 会幸丸ウコイカ		AP
Type: Transport
Builder: Harima Shipbuilding & Engineering Co., Aioi
Owner: Kaiyo Stamship Co.
Call Sign: JGXM
Official Number: 47966
Laid Down:		21.06.1940
Launched:		24.01.1941
Completed as cargo ship (3,548 GRT):		28.03.1941
Service:
Civilian, Kaiyo Stamship Co.		28.03.41–01.10.41
Requisitioned		01.10.1941
Ominato Guard District		01.10.41–31.03.44
Fate: Sunk 28.02.44 at 15:4 by USS Sand Lance (SS-381) E of Musashi Wan, off Paramushiro, Kurils (50°22'N, 15°26'E). 3 dead; ? saved.
Removed from Navy List:		31.03.1944
Commanding Officers:
?		?
Kaisho Maru 會昌丸		AP
Type: Transport
Builder: Harima Shipbuilding & Engineering Co., Aioi
Owner: Kaiyo Steamship Co.
Call Sign: JHWL
Official Number: 44609
Laid Down:		02.10.1937
Launched:		10.05.1938
Completed cargo ship (4,164 GRT):		30.06.1938
Service:
Civilian, Kaiyo Steamship Co.		30.06.38–20.09.41
Requisitioned		10.07.1941
Yokosuka ND		10.07.41–22.08.43
Converted to navy auxiliary		10.07.41–01.11.43
Fate: Sunk 22.08.43 at 17:06 by USS Tullibee (SS-284) some 300 nm NW of Truk (10°13'N, 147°20'E). 4 dead; ? saved.
Removed from Navy List:		01.11.1943
Commanding Officers:
?		?
Kanayamasan (Kinyamasan) Maru 金耶磨山丸		AP
Type: Transport
Builder: Harima Shipbuilding & Engineering Co.
Owner: Kaburagi Kisen
Call Sign: JGCP
Official Number: 48634
Laid Down:		10.07.1940
Launched:		14.04.1941
Completed as cargo ship (2,869 GRT):		28.06.1941
Service:
Civilian, Kaburagi Kisen		28.06.41–20.12.41
Requisitioned		20.12.1941
Kure ND		20.12.41–05.01.44
Fate: Badly damaged 22.11.43 by aircraft from USAAF 5th Air Force 70 nm NNW of Mussau Island, Papua New Guinea. Sunk 25.11.43 (01°55'S, 149°39'E). 5 dead; ? saved.
Removed from Navy List:		05.01.1944
Commanding Officers:
Capt Kasihi Tsutomu (M)	樫木　勉	31.12.41–
?		?
Kano Maru 鹿野丸		AP
Type: Transport
Builder: Uraga Dock Co, Uraga
Owner: Kokusai Steamship Co., Toyko
Call Sign: JRNJ
Official Number: 39657
Laid Down:		17.12.1932
Launched:		16.09.1933
Completed as passenger liner/cargo ship (8,572 GRT):		10.08.1934
Service:
Civilian, Kokusai Steamship Co.		10.08.34–01.10.41
Requisitioned		12.09.1941
Kure ND		01.10.41–20.11.41
Supply Unit, Combined Fleet		20.11.41–01.03.42
Kure ND		01.03.42–10.05.42
2nd Fleet		10.05.42–19.06.42
5th Fleet		19.06.42–01.07.43
Fate: Bady damaged 30.07.42 by USS Grunnion (SS-216) off Kiska, Aleuthians. Towed to Kiska Harbor and wrecked 22.09.42 in storm.
Removed from Navy List:		01.07.1943
Commanding Officers:
Capt Miura Tomosaburo (38)	三浦友三郎	01.10.41–05.03.42
Capt Inutsuka Koreshige (39)	犬塚惟重	05.03.42–28.03.42
Capt Arim Tadashi (36)	有馬　直	28.03.42–18.04.42
Capt Aiura Seiichi (33)	相浦誠一	18.04.42–22.09.42
Kasagisan Maru 笠置山丸		AP
Type: Transport
Builder: Mitsui Engineering & Shipbuilding, Tamano
Owner: Mitsui Bussan
Call Sign: JKTB
Official Number: 30525
Laid Down:		15.07.2024
Launched:		28.01.2025
Completed as cargo ship (2,427 GRT):		26.03.2025
Service:
Civilian, Mitsui Bussan		26.03.25–01.32
Requisitioned by Army		01.32–
Civilian, Mitsui Bussan		–25.03.41
Chartered by Navy		25.03.1941
Requisitioned		15.10.1941
Sasebo ND		15.10.41–15.05.42
3rd South Exp Fleet		15.05.42–25.08.42
SW Area Fleet		25.08.42–10.01.45
Fate: Grounded 08.11.44 in storm off San Fernando, Luzon. subsequently sunk there (16°37'N, 120°19'E) on 25.11.44 by aircraft from USS Essex (CV‑9) and USS Langley (CVL‑27). 34 dead; ? saved.
Removed from Navy List:		10.01.1945
Commanding Officers:
?		?
Kasuga Maru No.2 Go 第二號春日丸		AP
Type: Transport
Builder: Osaka Tekkosho
Owner: Naiai Steamship
Call Sign: JGOL
Official Number: 42068
Laid Down:		01.04.1936
Launched:		03.09.1936
Completed as cargo ship Kasuga Maru (3,987 GRT):		30.10.1936
Service:
Civilian		30.10.36–01.12.41
Requisitioned		10.11.1941
Converted to navy auxiliary		12.11.41–14.12.41
Renamed Kasuga Maru No. 2		10.12.1941
Sasebo ND		01.12.41–20.04.43
Fate: Sunk 13.03.43 by Dutch Submarine HrMs O-21 off Port Blair harbor, Andamans (11°40'N, 92°50'E). 21 dead; ? saved.
Removed from Navy List:		20.04.1943
Commanding Officers:
?		?
Kasumi Maru 霞丸		AP
Type: Transport
Builder: Hong Kong & Whampoa Dock Co.
Call Sign: JWZY
Official Number:
Laid Down:		29.03.1905
Launched:		?
Completed as cargo ship S/S Kampar (971 GRT)		29.03.1905
Service:
Civilian, Straits Steamship Co., Singapore as S/S Kampar		1915–28.08.39
Requisitioned by Royal Navy as submarine chaser HMS Kampar		28.08.1939
Beached after by bombing by Japanese aircraft at Penang, Malaya.		13.12.1941
Salvaged and repaired by Japanese		1942–1943
Commissioned as Kasumi Maru		31.10.1943
?		31.10.43–10.08.44
Fate: Sunk 12.05.44 a mine (probably Japanese) in the Straits of Malacca (03°50'N, 99°30'E).
Removed from Navy List:		10.08.1944
Commanding Officers:
?		?:
Keisho Maru 惠昭丸けいしょうまる		AP
Type: Transport
Builder: Uraga Dock Co., Uraga
Owner: Showa Merchant Marine Co.
Call Sign: JRRB
Official Number: 34513
Laid Down:		05.10.2028
Launched:		11.03.2029
Completed cargo ship as Kowa Maru (5,879 GRT):		27.06.2029
Service:
Civilian, Showa Shosen		27.06.29–02.10.37
Renamed Keisho Maru		22.12.1934
Civilian, Taiyo Shipping Co.		02.10.37–25.07.41
Requisitioned		25.07.1941
Yokosuka ND		25.07.41–10.04.42
Kure ND		10.04.42–01.12.43
Fate: Sunk 12.10.43 by aircraft of USAAF 5th Air Force at Rabual (05°15'S, 152°40'E) ? dead; ? saved.
Removed from Navy List:		01.12.1943
Commanding Officers:
Capt Ikeuchi Masamichi (40)	池内正方	05.09.41–25.10.42
Capt Miyamoto Sadachika (39)	宮本定知	25.10.42–06.04.43
Capt Takashimada Masaki (35)	高島田政耕	06.04.43–18.01.44
*Capt Kondo Saburo (46)	近藤三郎	18.01.44–08.07.44
Keishu Maru 慶州丸		AP
Type: Transport
Builder: Hong Kong & Whampoa Dock Co.
Call Sign: JWNY
Official Number: —
Laid Down:		?
Launched:		01.05.2021
Completed as salvage tugboat S/S Henry Keswick (671 GRT)		?
Service:
Civilian, Hong Kong & Whampoa Dock Co.		1921–02.42
US Army as USAT Henry Keswick		02.42–09.04.42
Sunk by Japanese artillery in Manila Bay off Corregidor Island		09.04.1942
Raised and repaired by IJN as Keishu Maru		20.04.1943
?		20.04.43–03.05.47
Fate: Sunk 12.01.45 by aircraft from US Navy TF 38 in Luzon Strait, South China Sea, off the coast of Indochina.
Removed from Navy List:		03.05.1947
Commanding Officers:
US Navy *Lt(jg) T.E. Donaldson (USNR)		02.42–09.04.42
?		?
Kenryu Maru 乾隆丸		AP
Type: Transport
Builder: Mitsui Engineering & Shipbuilding, Tamano
Owner: Inui Steamship Co.
Call Sign: JGVJ
Official Number: 41073
Laid Down:		04.05.1935
Launched:		12.10.1935
Completed as cargo ship (4,575 GRT):		15.11.1935
Service:
Civilian, Inui Steamship Co.		15.11.35–16.12.40
Requisitioned		16.12.1940
Maizuru ND		16.12.40–01.41
2nd Base Force, 3rd Fleet		01.41–10.03.42
Maizuru ND		10.03.42–05.01.44
Fate: Sunk 30.11.43 by USS Snapper (SS-185) ca. 15 nm NW Hachijo Jima (33°16'N, 139°35'E). 4 dead; ? saved.
Removed from Navy List:		05.01.1944
Commanding Officers:
Capt Yamashima Motonori (39)	八島元徳	26.12.40–25.04.42
Cdr Takeishi Hideto (38)	武石秀登	25.04.42–
Kensho Maru 乾祥丸ションケ		AP
Type: Transport
Builder: Tama Shipyard, Tamano
Owner: Inui Steamship Co.
Call Sign: JQDM
Official Number: 44843
Laid Down:		28.02.1938
Launched:		30.06.1938
Completed as cargo ship (4,861 GRT):		30.08.1938
Service:
Civilian, Inui Steamship Co.		30.08.38–15.10.41
Chartered by Navy		15.09.40–15.10.41
Requisitioned		15.10.1941
Yokosuka ND		15.10.41–10.11.44
Fate: Badly damaged 20.12.43 by aircraft, towed to Truk and sunk there 17.02.44 by aircraft from US Navy TF 58 (07°23'N, 151°51'E). 6 dead; ? saved.
Removed from Navy List:		10.11.1944
Commanding Officers:
?		?
Kenyo Maru 乾洋丸ウヨンケ		AOT
Type: Transport
Builder: Harima Shipbuilding & Engineering Co.
Owner: Inui Steamship Co.
Call Sign: JHYL
Official Number: 44845
Laid Down:		24.11.1937
Launched:		08.08.1938
Completed as merchant tanker (6,486 GRT):		15.10.1938
Service:
Civilian, Inui Steamship Co.		15.10.38–02.09.41
Requisitioned		02.09.1941
Yokosuka ND		02.09.41–29.05.42
Uraga. Converted to navy auxiliary		04.09.41–30.09.41
2nd Fleet		29.05.42–01.05.43
Fate: Sunk 23.03.43 at 03:20 by USS Whale (SS-239) about 120 nm NNW of Saipan (17°20'N, 145°00'E). 164 dead; ? saved.
Removed from Navy List:		01.05.1943
Commanding Officers:
Capt Honda Genzou (36)	本田源三	16.09.41–27.02.42
Capt Tanii Suekichi (33)	谷井末吉	27.02.42–20.10.42
Capt Tomita Kenshiro (37)	富田賢四郎	20.10.42–23.03.43
Kikukawa Maru 菊川丸ワカクキ		AP
Type: Transport
Builder: Kawasaki Dockyard, Kobe
Owner: Kawasaki Steamship Co.
Call Sign: JNOL
Official Number: 42941
Laid Down:		22.08.1938
Launched:		16.12.1936
Completed as cargo ship (3,833 GRT):		10.04.1937
Service:
Civilian, K Line		10.04.37–08.37
Requisitioned by Army		08.37–12.37
Civilian, K Line		12.37–15.10.41
Chartered by IJN		27.03.41–15.10.41
Requisitioned		15.10.1941
Sasebo ND		15.10.41–01.12.43
Fate: Sunk 07.10.43 by internal explosion at Truk, Carolines. (07°22'N, 151°54'E). 44 dead; ? saved.
Removed from Navy List:		01.12.1943
Commanding Officers:
?		?
Kimishima Maru 君島丸		AP
Type: Transport
Builder: Tsurumi Seitetsu Zosen
Owner: Iino Shipping Sangyo
Call Sign: JMJM
Official Number: 44826
Laid Down:		29.06.1937
Launched:		01.05.1938
Completed cargo ship (5,193 GRT):		10.07.1938
Service:
Civilian, Iino Shipping Sangyo		10.07.38–01.08.40
Requisitioned by Army		01.08.40–04.09.40
Civilian, Iino Shipping Sangyo		04.09.40–04.10.40
Requisitioned by Navy		04.10.1940
Sasebo ND		04.10.40–26.12.40
Tsurumi. Converted to navy auxiliary		16.12.40–31.01.41
Yokosuka ND		26.12.40–10.04.41
1st Base Force, 3rd Fleet		10.04.41–10.03.42
2nd Southern Exp Fleet		10.03.42–10.04.42
Sasebo ND		10.04.42–31.03.44
Fate: Sunk 23.02.44 at 14:45 by USS Plunger (SS-179) some 32 nm NE of Tori-shima, Izu Is. (30°11'N, 140°49'E). 14 dead; ? saved.
Removed From Navy List:		31.03.1944
Commanding Officers:
Capt Matsubara Hiromi (39)	松原寛三	15.11.40–12.03.41
Capt Maesawa [?] (37)	前沢弼治	12.03.41–
Kimposan Maru 金峰山丸		AP
Type: Transport
Builder: Mitsui Engineering & Shipbuilding, Tamano
Owner: Mitsui Bussan
Call Sign: JNEL
Official Number: 42634
Laid Down:		19.10.1936
Launched:		21.12.1936
Completed as cargo ship (3,261 GRT):		06.02.1937
Service:
Civilian,		06.02.37–15.10.41
Requisitioned		15.10.1941
Yokosuka ND		15.10.41–01.04.43
Fate: Sunk 17.01.43 by USS Greenling (SS-213) W of Kavieng, New Ireland, Bismarcks (02°47'N, 149°10.'E). 31 dead; ? saved.
Removed from Navy List:		01.04.1943
Commanding Officers:
?		?
Kinai Maru 畿内丸イナキ		AP
Type: Transport
Builder: Mitsubishi Shipbuilding & Engineering Co., Nagasaki
Owner: Osaka Merchant Marine Co.
Call Sign: JJBC
Official Number: 35936
Laid Down:		01.10.2029
Launched:		01.04.1930
Completed cargo ship (8,360 GRT):		15.06.1930
Service:
Civilian, OSK Line		15.06.30–20.09.41
Requisitioned		20.09.1941
Saebo ND		20.09.41–15.07.43
Fate: Sunk 11.05.43 at 08:27 by USS Plunger (SS-179) ca. 240 nm E of Saipan, Marianas (14°33'N, 179°23'E). 1 dead; ? saved.
Removed from Navy List:		15.07.1943
Commanding Officers:
Capt Matsubara Hiromi (39)	松原　寛三	20.09.41–20.11.42
Capt Ono Yoshitaka	大野　善隆	20.11.42–11.05.43
Kinsen Maru 金泉丸		AP
Type: Transport
Builder: Harima Shipbuilding & Engineering Co.
Owner: Chosen Yusen Co.
Call Sign: JEWG
Official Number: C2282
Laid Down:		10.05.1936
Launched:		27.02.1937
Completed as cargo ship (3,081 GRT):		15.04.1937
Service:
Civilian, Chosen Yusen		15.04.37–10.12.41
Requisitioned		10.12.1941
Sasebo ND		10.12.41–31.12.41
Chinkai Guard District		31.12.41–
Civilian, Chosen Yusen		30.06.45–15.08.45
SCAJAP		15.08.45–
Fate: Surrendered. Handed over to Korea 01.02.46. Transferred to Korea Steamship Co., Inchon and renamed Kumchon. Scrapped 1976.
Commanding Officers:
Capt Mineoka Kouichi (M)	峰岡甲一	13.03.43–
Kinugasa Maru 衣笠丸サガヌキ		AV / AP
Type: Transport
Builder: Kawasaki Shipbuilding, Kobe
Owner: Kokusai Steamship Co.
Call Sign: JHEJ
Official Number: 41285
Laid Down:		10.08.1935
Launched:		26.12.1935
Completed as passenger/cargo ship (8,407 GRT):		28.02.1936
Service:
Civilian, K Line		28.02.36–14.08.37
Requisitioned by Navy		14.08.1937
Yokosuka. Converted to seaplane tender		14.08.37–27.09.37
Kure ND		27.09.37–15.10.37
2nd Fleet		15.10.37–01.12.37
4th NAG, 4th Fleet		01.12.37–28.04.38
Kure ND		28.04.38–15.10.39
Converted to transport		28.04.38–07.05.38
Civilian, K Line		15.10.39–05.11.41
Requisitioned by Navy		05.11.1941
Converted to navy auxiliary		10.11.41–20.11.41
?		05.11.41–07.10.44
Fate: Sunk 07.10.44 at 22:24 by USS Hawkbill (SS-366) ca. 280 nm west of Manila, Philippines (14°30'N, 115°46'E). 43 dead; ? saved.
Commanding Officers:
Capt Katahara Tsunejiro (37)	片原常次郎	08.08.37–15.11.37
Cdr Aoki Taijiro (41)	青木泰二郎	15.11.37–28.04.38
Capt Hidai Toraji (37)	日台虎治	28.04.38–01.12.38
Capt Ishido Yuzo (36)	石戸勇三	01.12.38–15.06.39
Capt Kioka Arimatsu (40)	木岡蟻志松	15.06.39–07.05.42
Capt Arima Tadashi (36)	有馬　直	07.05.42–
Kiri Maru No. 8 第八桐丸リキ		AP
Type: Transport
Builder: Sanoyasu Dock Co., Osaka
Owner: Sanyo Nenryo Steamship Co.
Call Sign: JTYL
Official Number: 43730
Laid Down:		01.04.1937
Launched:		22.08.1937
Completed as cargo ship (945 GRT):		23.10.1937
Service:
Civilian, Sanyo Nenryo Steamship Co.		23.10.37–18.11.38
Requisitioned		18.11.1938
Gunboat		18.11.38–05.12.40
Civilian,		05.12.40–10.01.44
Requisitioned		10.01.1944
?		10.01.44–10.01.45
Fate: Sunk 07.11.44 by USS Greenling (SS-213) S of Honshu, Japan (34°34'N, 138°35'E).
Removed from Navy List:		10.01.1945
Commanding Officers:
Resv Lt(jg) Yoshioka Shigematsu	吉岡茂松	18.11.37–15.05.39
Resv Lt(jg) Naito Shigeru	内藤　蕃	15.05.39–
Kirikawa Maru 桐川丸ワカリキ		AP
Type: Transport
Builder: Kawasaki Shipbuilding Co, Kobe
Owner: Kawasaki Steamship
Call Sign: JYML
Official Number: 43735
Laid Down:		16.02.1937
Launched:		26.04.1937
Completed as cargo ship (3,836 GRT):		10.12.1937
Service:
Civilian, K Line		10.12.37–27.12.40
Chartered by Navy		27.12.40–15.10.41
Converted to navy auxiliary		27.12.40–15.01.41
Sasebo ND		15.10.41–01.04.43
Fate: Sunk 27.02.43 by aircraft from US Navy and USAAF ca. 10 nm NE of Vela Lavella, Solomons (07°32'S, 156°44'E). ? dead; 0 saved.
Removed from Navy List:		01.04.1943
Commanding Officers:
?		?
Kirishima Maru 霧島丸		AP
Type: Transport
Builder: Kawasaki Shipbuilding Co, Kobe
Owner: Kokusai Steamship Co.
Call Sign: JGIC
Official Number: 36919
Laid Down:		06.08.1930
Launched:		03.04.1931
Completed as cargo ship (5,840 GRT):		05.07.1931
Service:
Civilian, Kokusai Steamship Co.		05.07.31–10.11.41
Requisitioned		10.11.1941
Kure ND		10.11.41–15.03.43
Converted to navy auxiliary		17.11.41–24.11.41
Reclassified as tanker (8,267 GRT)		25.12.42–22.02.43
Kure ND		15.03.43–25.09.43
Fate: Sunk 25.09.43 by USS Bowfin (SS-287) in the South China Sea , 220 nm N of Nha Trang, Indochina (09°50'N, 112°03'E). 14 dead; ? saved.
Removed from Navy List:		01.12.1943
Commanding Officers:
Capt Matsuda Genjiro (34)	松田源次郎	10.11.41–24.11.41
Capt Okubo Hiroshi (33)	大窪　博	24.11.41–22.07.43
Capt Mizokami Shigezo	溝上重造	22.07.43–25.09.43
Kita Maru 喜多丸		AP
Type: Transport
Builder: Werf Gusto A.F. Smulders, Schiedam, Netherlands
Owner: GGM
Call Sign: JWVY
Official Number:
Laid Down:		?
Launched:		01.04.1905
Completed as GGM patrol vessel G.m.s. Gemma (845 GRT)		22.04.2020
Service:
Civilian, GGM		1918–25.09.39
Militarized, GGM		25.09.39–02.03.42
Scuttled by crew at Soerabaja		02.03.1942
Raised and repaired by Japanese as Kita Maru		01.08.1943
Station ship, Koepang, Timor.		01.08.43–03.05.47
Fate: Surrendered at Makassar. Returned to GGM. Used as hydrographic vessel 1946-1947.
Removed from Navy List:		03.05.1947
Commanding Officers:
?		?
Kizugawa Maru 木津川丸ワヅヅキ		AP
Type: Transport
Builder: Kawaminami Heavy Industries, Koyagi
Owner: Toyo Shipping
Call Sign: JHOP
Official Number: 48643
Laid Down:		12.10.1940
Launched:		11.05.1941
Completed cargo ship (1,915 GRT):		03.07.1941
Service:
Civilian, Toyo Shipping Co.		03.07.41–01.01.44
Chartered by Navy		29.09.43–01.01.44
Yokosuka ND		01.01.44–18.07.44
Fate: badly damaged 08.04.44 by USS Seahorse (SS-304) off Guam. 37 dead. Towed to Guam and sunk there 27.06.44
Removed from Navy List:		18.07.1944
Commanding Officers:
?		?
Kofuku Maru 光福丸コウフク		AP
Type: Transport
Builder: Mitsui Engineering & Shipbuilding, Tamano
Owner: Yamashina Steamship
Call Sign: JRGJ
Official Number: 39099
Laid Down:		02.11.1933
Launched:		03.03.1934
Completed (3,209 GRT):		04.05.1934
Service:
Civilian, Yamashina Steamship		04.05.34–1938
Requisitioned by Army		1938–1940
Civilian, Yamashina Steamship		1940–16.08.41
Requisitioned		16.08.1941
Maizuru ND		05.09.41–01.11.43
Fate: Sunk 06.09.43 in collision with Maoka Maru in the Sea of Japan, 20 nm S of Sado Island (37°42'N, 138°17'E). 0 dead; ? saved.
Removed from Navy List:		01.11.1943
Commanding Officers:
?		?
Kogane Maru こがね丸		AP
Type: Transport
Builder: Mitsubishi Heavy Industries, Kobe
Owner: Osaka Merchant Marine Co.
Call Sign: JPTK
Official Number: 41930
Laid Down:		11.12.1935
Launched:		23.05.1936
Completed as passenger liner (1,905 GRT)		29.08.1936
Service:
Civilian, OSK Line		29.08.36–10.08.43
Requisitioned		10.08.1943
Kure ND		10.08.43–31.07.44
Kure SubRon		31.07.44–05.09.44
Reclassified as transport		05.09.1944
Kure ND		05.09.44–01.05.45
51st Squadron, Maizuru ND		01.05.45–10.08.45
Fate: Surrendered. Allotted SCAJAP No. K-087. Returned to original owners 10.08.46. Scrapped 1971.
Removed from Navy List:		03.05.1947
Commanding Officers:
Capt Nakajima Chihiro (43)	中嶋千尋	01.03.45–01.05.45
Capt Ito Takashi (39)	伊藤徳尭	01.05.45–
Kokai Maru 黄海丸		AP
Type: Transport
Builder: Hakodate Dock Co., Hakodate
Owner: Shimatani Steamship Co.
Call Sign: JPSJ
Official Number: 45707
Laid Down:		01.05.1938
Launched:		01.01.1939
Completed as cargo ship (3,871 GRT):		01.05.1939
Service:
Civilian, Shimatani Steamship Co.		05.39–03.10.41
Requisitioned		03.10.1941
Maizuru ND		10.11.41–15.05.42
Removed from Navy List:		15.05.1942
Under repair		15.05.42–20.10.42
Civilian, Shimatani Steamship Co.		24.10.42–15.09.43
Requisitioned		18.09.1943
Kure ND		18.09.43–30.04.44
Fate: Sunk 21.02.44 by aircraft of 345th Bomb Group (5th Air Force) N of New Hanover, New Ireland, Bismarcks (02°30'S, 150°15'E). 26 dead; ? saved.
Removed from Navy List:		30.04.1944
Commanding Officers:
?		?
Kosei Maru 幸成丸イセコ		AP
Type: Transport
Builder: Harima Dock Co., Aioi
Owner: Shimatani Steamship Co.
Call Sign: JPQA
Official Number: 29816
Laid Down:		21.10.2023
Launched:		27.02.2024
Completed as cargo ship Meiji Maru (2,205 GRT):		06.04.2024
Service:
Civilian		06.04.24–15.10.41
Redesignated Kosei Maru		12.09.1933
Chartered by Navy		29.12.38–15.10.41
Requisitioned by Navy		15.10.1941
Sasebo ND		15.10.41–10.03.44
Fate: Sunk 27.01.44 by USS Thresher (SS-200) ca. 54 nm SW of Takao, Taiwan (22°10'N, 119°30'E). 19 dead; ? saved.
Removed from Navy List:		10.03.1944
Commanding Officers:
Capt Shirane Toshio (M)		29.12.38–05.04.39
? (M)		05.04.39–01.12.39
Capt Shirane Toshio (M)		01.12.39–05.04.40
? (M)		05.04.40–
Capt Izumi Masayori (M)	和泉正頼	1941–
Kosei Maru 興西丸イセコ		AP
Type: Transport
Builder: Mitsubishi Heavy Industry, Yokohama
Owner: Chosen Steamship Co.
Call Sign: JEZG
Official Number: C 2290
Laid Down:		25.01.1937
Launched:		09.06.1937
Completed (3,551 GRT):		30.08.1937
Service:
Civilian, Chosen Steamship Co.		30.08.37–15.10.41
Requisitioned		15.10.1941
Sasebo ND		15.10.41–10.04.42
Kure ND		10.04.42–11.11.43
Fate: Sunk 11.11.43 by USS Sargo (SS-188) ca. 60 nm ESE Kikaishima, Amami-Oshima, Satsunan Is. (27°40'N, 109°28'E). 12 dead; ? saved.
Removed from Navy List:		05.01.1944
Commanding Officers:
Capt Mineoka Kouichi (M)	峰岡甲一	1941–
Koshin Maru 廣進丸		AP
Type: Transport
Builder: Osaka Shipbuilding, Hiroshima
Owner: Hiromi Shoji
Call Sign: JPKA
Official Number: 30415
Laid Down:		06.04.1905
Launched:		01.04.2024
Completed passenger-cargo ship (5,485 GRT)		15.06.2024
Service:
Civilian, Hiromi Shoji		15.06.24–02.11.41
Navy charter		02.11.41–10.04.42
Kure. Converted to navy auxiliary		03.11.41–22.11.41
Civilian, Hiromi Shoji		10.04.42–01.12.42
Requisitioned		01.12.1942
Kure ND		01.12.42–31.08.43
Converted to tanker		01.12.42–03.02.43
Returned to owners		31.08.1943
Requisitioned by Shipping Control Board		01.09.1943
Attached to Kure ND		01.09.43–22.01.44
Fate: Sunk 22.01.44 by USS Tinosa (SS-283) about 120 nm N of Labuan, Borneo (07°22'N, 115°05'E). 22 dead; ? saved.
Commanding Officers:
?		?
Koshin Maru 興新丸		AP
Type: Transport
Builder: Osaka Shipbuilding, Hiroshima
Owner: Okada Gumi
Call Sign: JQPM
Official Number: 44585
Laid Down:		?
Launched:		16.06.1938
Completed as cargo ship (6,530 GRT):		27.09.1938
Service:
Civilian, Kansai Kisen		27.09.38–20.11.41
Converted to navy auxiliary		08.11.41–23.11.41
Chartered by Navy		20.11.41–10.04.42
Civilian, Kansai Kisen		10.04.42–03.02.43
Requisitioned by Navy		03.02.1943
Kure ND		03.02.43–10.04.42
Fate: Sunk 09.08.44 by internal explosion 100 nm N of Ishigaki-jima, Yaeyama Is. (26°10'N, 124°15'E). 28 dead; ? saved.
Removed from Navy List:		10.04.1942
Commanding Officers:
Capt Takeshita Takeshi (M)	竹下　隆	02.43–12.43
Capt Shimaji Iwao (M)	島地　巖	12.43–05.01.44
Capt Hanazaki [?] (M)	花崎問吾	05.01.44–
Koto Maru 興東丸トコ		AP
Type: Transport
Builder: Nakata Shipbuilding Co., Osaka
Owner: Sanko Steamship Co.
Call Sign: JHTN
Official Number: 45735
Laid Down:		?
Launched:		08.07.1939
Completed as cargo ship (1,053 GRT)
Service:
Civilian, Sanko Steamship Co.		08.07.39–04.06.41
Chartered by Navy		04.06.41–15.10.41
Requisitioned by Navy		15.10.1941
Yokosuka ND		15.10.41–01.12.41
Ominato Guard District, Ominato ND		01.12.41–10.08.44
Fate: Sunk 31.05.44 at 12:35 by USS Barb (SS-220) ca. 70 nm W of Matsuwa, Kuriles (47°55'N, 151°42'E). 30 dead; ? saved.
Removed from Navy List:		10.08.1944
Commanding Officers:
?		?
Koto Maru No. 2 第2興東丸トコ		AP
Type: Transport
Builder: Mitsubishi Heavy Industries, Yokohama
Owner: Chosen Yusen
Call Sign: JEXG
Official Number: C2287
Laid Down:		03.12.1936
Launched:		07.05.1937
Completed as cargo ship Koto Maru (3,557 GRT):		30.06.1937
Service:
Civilian, Chosen Yusen		30.06.37–10.12.41
Converted to navy auxiliary		02.11.41–03.01.42
Requisitioned as Koto Maru No. 2		10.12.1941
Sasebo ND		10.12.41–02.06.44
11th Base Force, Southern Fleet		02.06.44–10.03.45
Fate: Sunk 07.07.44 at 01:05 by USS Flasher (SS-249) off Cape Varella, Indochina (13°08'N, 109°28'E). 2 dead; ? saved.
Removed from Navy List:		10.03.1945
Commanding Officers:
?		?
Kozui Maru 高瑞丸		AP
Type: Transport
Builder: Mitsubishi Heavy Industries, Yokohama
Owner: Takachiho Merchant Marine Co.
Call Sign: JNUL
Official Number: 42963
Laid Down:		07.11.1936
Launched:		27.02.1937
Completed as cargo ship (7,072 GRT):		30.06.1937
Service:
Civilian, Takachiho Shosen		30.06.37–10.11.41
Requisitioned by Navy		02.11.1941
Maizuru ND		10.11.41–31.08.43
Convereted to navy auxiliary		10.11.41–06.01.42
Civilian, Takachiho Shosen		31.08.43–14.10.43
Fate: Sunk 14.10.43 by USS Grayback (SS-208) NW of Okinawa (27°35'N, 127°30'N). 28 dead; 79 saved.
Commanding Officers:
?		?
Kumagawa (Tamagawa or Shumagawa) Maru 球磨川丸		AP / AOT
Type: Transport
Builder: Mitsubishi Heavy Industries, Nagasaki
Owner: Toyo Steamship Co., Tokyo
Call Sign: JRBJ
Official Number: 38753
Laid Down:		23.01.1933
Launched:		05.12.1933
Completed cargo ship (7,510 GRT):		31.03.1933
Service:
Civilian, Toyo S/S Co.		31.03.33–13.09.37
Requisitioned by Army, Ship No. 392		13.09.37–
Requisitioned		20.09.1941
Maizuru ND		20.09.41–26.10.41
Osaka. Converted to navy auxiliary		20.09.41–26.10.41
2nd Base Force, 3rd Fleet		26.10.41–12.41
1st Base Force, 3rd Fleet		12.41–15.02.43
Yokosuka. Converted to tanker		10.10.42–13.02.43
Maizuru ND		15.02.43–10.03.45
Fate: Sunk 12.01.45 by aircraft of US Navy TF 38 of St. Jacques, Indochina (10°20N, 107°05'E).
Removed from Navy List:		10.03.1945
Commanding Officers:
Capt Yoshida Shiro (36)	吉田四郎	20.09.41–20.05.42
Capt Miyoshi Shichiro (34)	三好七郎	20.05.42–12.01.45
Kunishima Maru 國島丸		AP
Type: Transport
Builder: Harima Shipbuilding & Engineering Co., Aioi
Owner: Iino Shipping Sangyo
Call Sign: JHJL
Official Number: 42978
Laid Down:		05.03.1937
Launched:		04.06.1937
Completed as cargo ship (4,083 GRT):		30.08.1937
Service:
Civilian, Iino Shipping Sangyo		30.08.37–09.38
Civilian, Nippon Yusen Kaisha		09.38–24.01.40
Chartered by Navy		24.01.40–15.10.41
Requisitioned		15.10.1941
Yokosuka ND		15.10.41–10.04.42
Kure ND		10.04.42–31.03.44
Fate: Grounded 24.02.44 in the Kumano-Nada Sea, 8 nm SW Daio-Saki lighthouse, Honshu, Japan (34°12'N, 136°49'E). ? dead; ? saved.
Removed from Navy List:		31.03.1944
Commanding Officers:
Capt Kajikawa Masao (M)	梶川正雄	1941–
Capt Shinjo Chutaro (M)	新荘忠太郎	18.02.44–
Kunitsu Maru 國津丸		AP
Type: Transport
Builder: Harima Shipbuilding & Engineering Co., Aioi
Owner: Settsu Merchant Marine Co.
Call Sign: JHML
Official Number: 43473
Laid Down:		03.05.1937
Launched:		22.09.1937
Completed as cargo ship (2721 GRT):		30.10.1937
Service:
Civilian, Settsu Shosen		30.10.37–10.11.41
Requisitioned		10.11.1941
?		10.11.41–03.05.47
Fate: Sunk 09.04.45 by aircraft from USS Sarartoga (CV-3) and HMS Illustrious (87), British Far Eastern Fleet, at Sabang, Sumatra (05°54'N, 95°20'E).
Removed from Navy List:		03.05.1947
Commanding Officers:
?		?
Kyushu Maru 九州丸		AP
Type: Transport
Builder: Gomei Kaisha Dockyard, Amasaki
Owner: Gomei Kaisha Co., Amasaki
Call Sign: JPJK
Official Number: 41506
Laid Down:		04.09.1932
Launched:		29.01.1936
Completed (632 GRT):		21.01.1960
Service:
Civilian, Gomei Kaisha		02.36–01.04.44
Requisitioned		01.04.1944
?		01.04.44–10.08.45
Fate: Sunk 27.06.45 by US aircraft [?] E of Otsu, Japan.
Removed from Navy List:		10.08.1945
Commanding Officers:
?		?
Manko (Banko) Maru 萬光丸		AP
Type: Transport
Builder: Yokohama Dock Co., Yokohama
Owner: Kinkai Yusen
Call Sign: JYSJ
Official Number: 40767
Laid Down:		27.09.1934
Launched:		29.06.1935
Completed as cargo ship (4,471 GRT):		30.08.1935
Service:
Civilian, Kinkai Yusen		30.08.35–25.08.37
Requisitioned		25.08.1937
Yokosuka ND		25.08.37–27.08.37
Sasebo ND		27.08.37–10.09.44
Fate: Sunk 31.07.44 by USS Parche (SS-384) near the Bashi Channel, off the NW coast of Luzon, Philippines (19°08'N, 120°51'E). 297 dead; ? saved.
Removed from Navy List:		10.09.1944
Commanding Officers:
Capt Izawa Tetsu (38)	井沢　徹	25.08.37–15.11.37
Capt Kojima Tadashi (40)	小島　正	15.11.37–10.06.38
Capt Teragaki Keizo (40)	寺垣敬三	10.06.38–13.03.39
Capt Sekimoto Orinosuke (38)	関本織之助	13.03.39–10.12.40
Capt Wakisaka Johei (38)	脇坂兼平	10.12.40–22.04.42
Capt Inagami Shinjo (33)	稲上信壮	22.04.42–10.09.42
Capt Okano Ikkan (36)	岡野一幹	10.09.42–27.12.42
Manryu Maru 萬龍丸		AP
Type: Transport
Builder: Bergens Mekaniske Verksteder A/S, Bergen, Norway
Call Sign: JWFY
Official Number:
Laid Down:		?
Launched:		20.01.2020
Completed as cargo ship (1,623 GRT)		01.11.2020
Service:
Civilian, A/S Ocean (John P. Pedersen & Søn), Kristiania, Norway as S/S Hufterø		29.01.1920
Civilian, Skibs A/S Lundegaard (Lundegaard & Sønner), Farsund, Norway as S/S Dageid		01.29–03.03.42
Scuttled by crew at Sourabaya		03.03.1942
Refloated and repaired by Japanese as Manryu Maru		15.11.1942
?		15.11.42–25.05.45
Fate: Sunk 16.04.45 by USS Sunfish (SS-281) off Yamado Harbor, Honshu (39°36'N, 142°05'E).
Removed from Navy List:		25.05.1945
Commanding Officers:
?		?
Matsumoto Maru 松本丸トモツマ		AP
Type: Transport
Builder: Yokohama Dock Co., Yokohama
Owner: Nippon Yusen
Call Sign: JCDA
Official Number: 28109
Laid Down:		28.10.2020
Launched:		08.04.2021
Completed as cargo ship (7,024 GRT):		05.05.2021
Service:
Civilian, NYK Line		05.05.21–
Requisioned by Army		20.08.38–20.01.39
Chartered by Navy		15.05.39–07.08.40
Civilian, NYK Line		07.08.40–26.10.41
Kure ND		10.11.41–27.11.41
Kure. Converted to navy auxiliary		31.10.41–27.11.41
Supply Unit, Combined Fleet		27.11.41–01.03.43
Reclassified as tanker		01.03.1943
Kure Naval Distract		01.03.43–31.08.43
Civilian, Shipping Control Board		31.08.43–25.10.44
Fate: Sunk 25.10.44 by USS Tang (SS-306) in the Taiwan Strait (25°04'N, 119°35'E). 0 dead; ? saved.
Commanding Officers:
Capt Kaneko Bunzaemon (M)		?
Capt Isobe Miokichi (32)	磯部三男吉	15.11.41–05.05.42
Capt Arima Tadashi (36)	有馬　直	05.05.42–20.07.42
Matsuyama Maru 松山丸		AP
Type: Transport
Builder: Murakami Dockyard
Owner: Seigo Kotsuna
Call Sign: JBYP
Official Number: 48686
Laid Down:		?
Launched:		24.05.1941
Completed as coaster (385 GRT):		24.07.1941
Service:
Civilian, Seigo Kotsuna		24.07.41–01.04.44
Requisitioned		01.04.1944
?		01.04.44–03.05.47
Fate: Sunk 26.06.44 [?].
Removed from Navy List:		03.05.1947
Commanding Officers:
?		?
Meisho Maru 明昭丸		AP
Type: Transport
Builder: Seigo Kotsuna
Owner: Meiji Shipping
Call Sign: JWXO
Official Number: 48703
Laid Down:		22.04.1940
Launched:		13.08.1941
Completed as cargo ship (2,737 GRT):		20.11.1941
Service:
Civilian, Meiji Shipping Co.		20.11.41–01.01.44
Requisitioned		01.01.1944
?		01.01.44–10.03.44
Fate: Sunk 16.01.44 by US Navy aircraft about 45 nm NW of New Hanover, Bismarcks (02°20'S, 149°42'E).
Removed from Navy List:		10.03.1944
Commanding Officers:
Capt Fukai Suetaka (M)	沖　季隆	1944–16.01.44
Meiten Maru 明天丸		AP
Type: Transport
Builder: Tama Shipyard, Tamano
Owner: Meiji Shipping
Call Sign: JQVM
Official Number: 45308
Laid Down:		23.04.1938
Launched:		18.09.1938
Completed as cargo ship (4,474 GRT):
Service:
Civilian, Meiji Shipping Co.		05.12.38–02.12.40
Requisitioned by Navy		02.12.1940
Yokosuka ND		16.12.40–02.10.41
Converted to navy auxiliary		02.10.41–10.12.41
Chartered by Navy		01.12.1942
Yokosuka ND		16.12.40–01.12.43
Fate: Sunk 30.06.43 at 15:00 by USS Tautog (SS-199) some 225 nm WNW of Saipan, Marianas (15°57'N, 140°57'E). ? dead; ? saved.
Removed from Navy List:		01.12.1943
Commanding Officers:
Capt Miyasaki Ichiro (41)	宮坂市郎	20.05.41–10.09.42
Capt Kamo [?] (39)	加茂亭佐	20.09.42–30.06.43
Meiyo Maru 明陽丸ヨイメ		AP
Type: Transport
Builder: Tama Shipyard, Tamano
Owner: Meiji Shipping
Call Sign: JYFN
Official Number: 46934
Laid Down:		07.03.1939
Launched:		27.10.1939
Completed as cargo ship (5,627 GRT):		24.06.1940
Service:
Civilian, Meiji Shipping Co.		24.06.40–20.09.41
Requisitioned		12.09.1941
Kure ND		20.09.41–25.08.42
Converted to navy auxiliary		20.09.41–27.09.41
Fate: Sunk 08.08.42 at 20:05 by USS S-38 (SS-143) ca. 14 nm W Cape St. George, New Britain, Bismarcks (04°50'S, 152°40'E). 373 dead; ? saved.
Removed from Navy List:		25.08.1942
Commanding Officers:
*Capt Koizumi Hisao (34)	小泉久雄	20.09.41–08.08.42
Mikage Maru No. 3 第3御影丸ゲカミ		AP
Type: Transport
Builder: Kobeseikosho Harima Heavy Industries, Kojo
Owner: Muko Steamship
Call Sign: JAYC
Official Number: 33188
Laid Down:		08.08.2027
Launched:		24.02.2028
Completed as passenger/cargo ship Mifune Maru (3,111 GRT):		11.04.2028
Service:
Civilian, Yamamoto Sajiro		11.04.28–1928
Civilian, Sanyo Co.		1928–30.06.31
Civilian, Nada Shogyo Ginko as Mikage Maru No. 3		30.06.31–03.09.41
Requisitioned		03.09.1941
Sasebo ND		20.09.41–10.08.42
Converted to navy auxiliary		20.09.41–01.10.41
Fate: Sunk 12.07.42 in collision with Anzan Maru in the Iyo Nada Strait, 3 nm S of Tsurishima, Japan (33°00'N, 133°00'E). ? dead; ? saved.
Removed from Navy List:		10.08.1942
Commanding Officers:
?		?
Mitakesan Maru 御嶽山丸ンサケタミ		AP
Type: Transport
Builder: Harima Shipbuilding & Engineering Co., Aioi
Owner: Kaburagi Steamship Co.
Call Sign: JHOL
Official Number: 44254
Laid Down:		09.06.1937
Launched:		06.11.1937
Completed as cargo ship (4,441 GRT):		21.06.1938
Service:
Civilian, Kaburagi Steamship Co.		21.06.38–10.02.38
Civilian, NYK Line		10.02.38–22.08.41
Requisitioned by IJN		22.08.1941
Yokosuka ND		20.09.41–10.07.44
Uraga. Conversion to navy auxiliary		03.09.41–30.09.41
Fate: Sunk 11.05.44 by USS Sandlance (SS-381) 20 nm W of Saipan, Marianas (14°57'N, 145°30'E). 1 dead; ? saved.
Removed from Navy List:		10.07.1944
Commanding Officers:
Capt Arima Tadashi (36)	有馬　直	20.09.41–15.12.41
Capt [?] (37)	国生行孝	15.12.41–10.07.42
Capt Kusumi Shoujiro	久住　庄次郎	10.07.42–15.11.43
Capt Tsda Takehiko (33)	津田威彦	13.11.43–11.05.44
Montevideo Maru もんてびでお丸オデビテンモ		AP
Type: Transport
Builder: Mitsubishi Heavy Industries, Nagasaki
Owner: Osaka Merchant Marine Co.
Call Sign: JIAB
Official Number: 31553
Laid Down:		09.09.2025
Launched:		15.04.2026
Completed as passenger/refrigerated cargo ship (7,266 GRT):		14.08.2026
Service:
Civilian, OSK Line		14.08.26–25.09.41
Chartered by Navy		25.09.41–31.12.41
Requisitioned by IJN		31.12.1941
Kure ND		31.12.41–20.07.42
Fate: Sunk 01.07.42 by USS Sturgeon (SS-187) about 65 nm W of Cape Bojeador, Luzon, Philippines (18°37'N, 119°29'E). 1,177 dead; ? saved.
Removed from Navy List:		20.07.1942
Commanding Officers:
?		?
Muko Maru 武庫丸コム		AP
Type: Transport
Builder: Osaka Shipbuilding Co.
Owner: Taihei Steamship Co.
Call Sign: JTUL
Official Number: 43725
Laid Down:		01.03.1937
Launched:		27.07.1937
Completed as cargo ship (4,862 GRT):		20.10.1937
Service:
Civilian, Taihei Steamship Co.		20.10.37–01.12.40
Requisitioned by IJN		01.12.1940
Yokosuka ND		01.12.40–05.01.44
Fate: Sunk 12.11.43 at 22:18 by USS Thresher (SS-200) ca. 110 nm NNE of Truk, Carolines (09°02'N, 152°46'E). 18 dead; ? saved.
Removed from Navy List:		05.01.1944
Commanding Officers:
Capt Abe Koun (41)	阿部耕運	10.05.41–20.09.41
Capt Yamanaka Junichi (34)	山中順一	20.09.41–
Myoko Maru 妙高丸コミョ		AP
Type: Transport
Builder: Tama Shipyard, Tamano
Owner: Itaya Shosen Co.
Call Sign: JYRL
Official Number: 43740
Laid Down:		19.05.1937
Launched:		10.11.1937
Completed as cargo ship (5,086 GRT):		24.12.1937
Service:
Civilian, Mitsui Bussan		06.02.38–15.10.40
Requisitioned		15.10.1940
Sasebo ND		15.10.40–10.04.41
Converted to navy auxiliary		01.11.40–09.12.40
1st Base Force, 3rd Fleet		10.04.41–10.03.42
2nd Southern Exp Fleet		10.03.42–01.08.43
Fate: Sunk 17.06.43 at 06:57 by USS Drum (SS-228) about 150 nm NNW of Rabaul, New Britain, Bismarcks (04°04'S, 154°03'E). 35 dead; 0 saved.
Removed from Navy List:		01.08.1943
Commanding Officers:
Capt Ishii Shizue (39)	石井芸江	15.10.40– 25.12.40
Capt Narahashi Norimoto (39)	楢橋憲基	25.12.40–20.09.41
Capt Abe Koun (41)	阿部耕運	20.09.41–20.08.42
Nachisan Maru 那智山丸ンサチナ		AP
Type: Transport
Builder: Mitsui Bussan Zosembu Tama Kojo
Owner: Mitsui Line Co.
Call Sign: JKEC
Official Number: 37153
Laid Down:		05.05.1931
Launched:		26.10.1931
Completed as cargo /passenger ship (4,433 GRT):		12.12.1931
Service:
Civilian, Mitsui Line		12.12.31–30.07.37
Requisitioned		30.07.1937
Yokosuka ND		30.07.37–01.11.37
Sasebo ND		01.11.37–05.01.44
Fate: Sunk 13.11.43 at 05:56 by USS Trigger (SS-237) in the Tsushima Straits, 60 nm SW of Saishuto [1], Korea (32°55'N, 125°09'E). 45 dead; 0 saved. [1] In Japanese called Saishuto (Shaishu-to), Chejudo (Jeju-do) in Korean, and Quelpart Island by Westerners.
Removed from Navy List:		05.01.1944
Commanding Officers:
Capt Sakai Takeo (39)	酒井武雄	31.07.37–10.08.38
Capt Motoizumi Takashi (37)	元泉　威	10.08.38–24.10.39
Capt Nakamaruo Yoshizo (36)	中円尾義三	24.10.39–23.12.40
Capt Yokoyama Yataro (38)	横山弥太郎	23.12.40–15.09.41
Capt Hara Seitaro (35)	原　精太郎	15.09.41–20.11.42
Capt Ikeda Keinosuke (34)	池田敬之助	20.11.42–25.04.43
*Capt Kawagoe Tadamitsu (33)	川越忠光	25.04.43–13.11.43
Nagisan Maru 那岐山丸ンサギナ		AP
Type: Transport
Builder: Mitsui Engineering & Shipbuilding, Tamano
Owner: Mitsui Bussan Co.
Call Sign: JJWC
Official Number: 36560
Laid Down:		14.08.1930
Launched:		05.03.1931
Completed (4,392 GRT):		25.04.1931
Service:
Civilian, Mitsui Bussan		25.04.31–10.01.42
Chartered by Navy		31.07.41–
Converted to navy auxiliary		20.12.41–03.01.42
Requisitioned		10.01.1942
Maizuru ND		10.01.42–10.05.44
Attached Combined Fleet		10.01.42–01.10.42
Attched 11th Fleet		01.10.42–10.05.44
Fate: Sunk 30.03.44 by US aircraft at Palau, Carolines (07°17'N, 134°25'E). 2 dead; ? saved.
Removed from Navy List:		10.05.1944
Commanding Officers:
Capt Geka Ryosaburo (36)	外賀良三郎	20.02.42–10.43
Capt Ishii Kameo (M)	石井亀雄	10.43–30.03.44
Nana Maru 南阿丸ナンア		AP
Type: Transport
Builder: Harima Shipbuilding & Engineering Co., Aioi
Owner: Osaka Merchant Marine Co.
Call Sign: JGJM
Official Number: 46836
Laid Down:		17.06.1939
Launched:		16.04.1940
Completed as cargo ship (6,757 GRT):		29.06.1940
Service:
Civilian, OSK Line		29.06.40–01.10.41
Requisitioned		01.10.1941
Maizuru ND		01.10.41–05.02.42
Fate: Sunk 23.01.42 at 21:00 by Dutch aircraft from 2-VLG-V in the Makassar Strait, off Balikpapan, Boreno (01°18'S, 117°43'E). ? dead; ? saved.
Removed from Navy List:		05.02.1942
Commanding Officers:
Capt Inohara Kunichi (33)	猪原薫一	01.10.41–23.01.42
Naniwa Maru 浪速丸ワニナ		AP
Type: Transport
Builder: Osaka Shipbuilding Co., Osaka
Owner: Taihei Steamship Co.
Call Sign: JTKL
Official Number: 42964
Laid Down:		03.12.1936
Launched:		19.04.1937
Completed as cargo ship (4,857 GRT):		30.06.1937
Service:
Civilian, Taihei Steamship Co.		30.06.37–11.04.41
Chartered by IJN		11.04.41–15.10.41
Requisitioned		15.10.1941
Yokosuka ND		15.10.41–25.08.42
Fate: Sunk 03.08.42 by USS Gudgeon (SS-211) ca. 40 nm W of Truk, Carolines (07°17'N, 150°46'E). 31 dead; ? saved.
Removed from Navy List:		25.08.1942
Commanding Officers:
Capt Yasuda J [?] (M)		11.41–
?		?
Nankai Maru 南海丸イカンナ		AP
Type: Transport
Builder: Mitsubishi Heavy Industries, Nagasaki
Owner: Osaka Shosen Co.
Call Sign: JKME
Official Number: 38116
Laid Down:		01.10.1931
Launched:		05.07.1932
Completed as cargo ship (8,416 GRT):		14.01.1933
Service:
Civilian, OSK Line		14.01.33–
Requisitioned		07.08.1941
Sasebo. Converted to navy auxiliary		18.08.41–27.11.41
Sasebo ND		10.11.41–20.11.41
3rd Fleet		20.11.41–10.03.42
Sasebo ND		10.03.42–10.11.44
Fate: Sunk 12.09.44 at 08:45 by USS Sealion (SS-315) in the South China Sea, E of Hainan (18°42'N, 114°30'E). 199 dead; ? saved.
Removed from Navy List:		10.11.1944
Commanding Officers:
Capt Maki Akira (32)	牧　　瑛	10.11.41–10.07.43
Capt Sanyoshi Toshiro (37)	実吉敏郎	10.07.43–23.09.43
Capt Yamauchi Kanzo (M)	山内謙三	23.09.43–
Nankai Maru No. 2 第二南海丸		AP
Type: Transport
Builder: Osaka Dockyard Co., Osaka
Owner: Toyo Sangyo
Call Sign: JNZM
Official Number: 47330
Laid Down:		?
Launched:		06.05.1940
Completed as cargo ship (1,960 GRT):		07.11.1940
Service:
Civilian, Toyo Sangyo		07.11.40–06.12.41
Requisitioned		06.12.1941
Converted to navy auxiliary		06.12.41–15.12.41
Yokosuka ND		10.12.41–05.02.44
Fate: Sunk 23.12.43 by aircraft from USN and USAAF at Mili, Marshalls (06°50'N, 171°43'E). ? dead; ? saved.
Removed from Navy List:		05.02.1944
Commanding Officers:
?		?
Nasusan Maru 那須山丸		AP / AOT
Type: Transport
Builder: Mitsui Engineering & Shipbuilding, Tamano
Owner: Mitsui Bussan CO.
Call Sign: JKCC
Official Number: 37133
Laid Down:		05.03.1931
Launched:		15.08.1931
Completed as cargo ship (4,399 GRT):		29.09.1931
Service:
Civilian, Mitsui Bussan CO.		29.09.31–20.07.41
Requisitioned by Navy		20.07.1941
Yokosuka ND		15.10.41–10.04.42
Civilian, Mitsui Bussan		10.04.42–03.12.42
Requisitioned by Navy and converted to tanker		03.12.42–02.01.43
Civilian, Mitsui Bussan		02.01.43–20.06.44
Fate: Sunk 24.06.44 by USS Tang (SS-306) in the Koshiki Straits, 40 nm SW of Nagasaki, Honshu, Japan (32°24'N, 129.°38'E). 11 dead; ? saved.
Commanding Officers:
?		?
Nichiei Maru 日營丸		AP
Type: Transport with strengthened hull for ice navigation
Builder: Naniwa Dock, Osaka
Owner: Okazaki Honten
Call Sign: JXQM
Official Number: 45323
Laid Down:		?
Launched:		11.12.1938
Completed as cargo ship (2,446 GRT):		05.04.1939
Service:
Civilian, Okazaki Honten		05.04.39–01.01.44
Requisitioned		01.01.1944
SW Area Fleet		01.01.44–10.11.44
Fate: Sunk 12.09.44 by aircraft from US Navy TF 38 off Cebu, Philippines (10°20'N, 124°00'E). 1 dead; ? saved.
Removed from Navy List:		10.11.1944
Commanding Officers:
Capt Ueda Kichisuke		22.06.44–
Nikkoku (Nichikoku) Maru 日國丸		AP
Type: Transport
Builder:
Owner: Nissan Steamship Co.
Call Sign: JNDO
Official Number: 48200
Laid Down:		?
Launched:		01.09.1940
Completed as cargo ship (2,728 GRT):		25.03.1941
Service:
Civilian, Nissan Steamship Co.		25.03.41–10.11.41
Requisitioned		10.11.1941
Maizuru ND		10.11.41–15.01.42
Converted to navy auxiliary		15.11.41–30.11.41
Fate: Grounded and stranded 13.12.41 off Samah, Hainan Island, China. Broke up and sunk 18.12.41.
Removed from Navy List:		15.01.1942
Commanding Officers:
Capt Mori Ryo (38)	毛利　良	20.11.41–18.12.41
Nichirin Maru 日輪丸		AP
Type: Transport
Fate: Charles Rennoldson & Co, Lawe Shipyard, South Shields, England
Call Sign: JWEY
Official Number: —
Laid Down:		?
Launched as S/S Mata Hari:		03.03.2015
Completed (1,020 GRT):		01.06.2015
Service:
Civilian, British India Steam Navigation Co. (P&O) as S/S Mata Hari		05.06.15–20.08.24
Civilian, P&O Steam Navigation Co.		20.08.24–01.09.39
Royal Navy, Malayan Auxiliary Fleet		01.09.39–15.02.42
Captured by Japanese 15nm off Muntok Island, Sumatra		15.02.1942
Bombed and sunk by Japanese		28.02.1942
Refloated and repaired as IJN communication ship Yumihara		1942–1943
Released for civilian Government use as Nichirin Maru		1943–27.12.43
Fate: Sunk 02.03.45 by aircraft of USN VP-119 in the East China Sea, 118 nm SE Wenchow, China (27°10'N, 124°35'E).
Removed from Navy List:		10.05.1945
Commanding Officers:
?		?
Nissei Maru 日晴丸		AP
Type: Transport
Builder: Amagasaki Dock Co., Osaka
Owner: Nippo Shokai Co.
Call Sign: JDMR
Official Number: 49215
Laid Down:		24.04.1905
Launched:		01.10.1941
Completed as cargo ship (833 GRT):		16.03.1942
Service:
Civilian, Nippo Shokai		16.03.42–15.06.42
Requisitioned		15.06.1942
Kure ND		15.06.42–10.06.43
Fate: Sunk 17.11.42 by USS Searaven (SS-196) in Flying Fish Cove, Christmas Island (10°30'N, 105°35'E). 1 dead; ? saved.
Removed from Navy List:		10.06.1943
Commanding Officers:
?		?
Nissho Maru No. 18 第十八日正丸ウショッニ		AP
Type: Transport
Builder: Osaka Shipbuilding Co., Innoshima
Owner: Marush Shipping Co.
Call Sign: JVRG
Official Number: 49371
Laid Down:		?
Launched:		01.05.1942
Completed as cargo ship (1,998 GRT):		28.09.1942
Service:
Civilian, Marush Shipping Co.		28.09.42–29.12.42
Requisitioned		29.12.1942
Yokosuka ND		29.12.42–30.06.45
Fate: Damaged 18.05.45 by mine off Awajishima. Surrendered damaged and repaired. Allotted SCAJAP No. N-024. Scrapped 09.69
Removed from Navy List:		30.06.1945
Commanding Officers:
Capt Yagi Sintra (M)	八木新寅	1943–
Nittei Maru 日帝丸		AP
Type: Transport
Builder: Osaka Shipbuilding Co., Osaka
Owner: Nissan Kisan Co.
Call Sign: JNCO
Official Number: 47865
Laid Down:		?
Launched:		06.06.1940
Completed as cargo ship (2,728 GRT):		21.01.1941
Service:
Civilian, Osaka Shipbuilding		21.01.41–
Chartered by Navy		25.07.41–15.10.41
Requisitioned by Navy		15.10.1941
Yokosuka ND		15.10.41–10.08.42
Reclassified as Collier:		10.08.1942
5th Fleet		10.08.42–18.06.44
Kuriles Defense		18.06.44–01.07.44
NE Area Fleet		01.07.44–05.11.44
Ominato Guard District		05.11.44–10.03.45
Fate: Wrecked 10.01.45 in the Sea of Japan, off Noto Peninsula (37°30'N, 137°22'E). 0 dead; ? saved.
Removed from Navy List:		10.03.1945
Commanding Officers:
?		?
Nojima Maru 野島丸		AP
Type: Transport
Builder: Mitsubishi Heavy Industries, Nagasaki
Owner: Nippon Yusen
Call Sign: JWFJ
Official Number: 40112
Laid Down:		03.02.1934
Launched:		24.10.1934
Completed as cargo ship (7,190 GRT):		13.02.1935
Service:
Civilian, NYK Lines		13.02.35–19.07.41
Chartered by Navy		19.07.41–20.09.41
Requisitioned		20.09.1941
Kure ND		20.09.41–01.12.41
9th Base Force, Southern Exp Fleet		01.12.41–03.01.43
9th Base Force, 1st South Exp Fleet		03.01.42–23.05.42
2nd Fleet		23.05.42–01.07.43
Fate: Badly damaged 28.09.42 by USAAF aircraft at Kiska. After sustaining several further bombing attacks, total constructive loss 20.04.43 (51°58'N, 177°33'E).
Removed from Navy List:		01.07.1943
Commanding Officers:
*Capt Itagaki Koichi (38)	板垣行一	20.09.41–16.09.42
?		?
Ogashima Maru 男鹿島丸		AP
Type: Transport
Builder: Mitsubishi Heavy Industries, Yokohama
Owner: Nakagawa Steamship Co.
Call Sign: JJDK
Official Number: 43128
Laid Down:		28.04.1936
Launched:		16.07.1936
Completed as cargo ship (1,424 GRT):		31.08.1936
Service:
Civilian, Nakagawa S/S Co.		31.08.36–06.12.41
Requisitioned		06.12.1941
4th Fleet		06.12.41–10.03.44
Fate: Sunk 20.01.44 by USAAF aircraft 80 nm SW of Yap, Carolinas (08°07'N, 137°38'E). 30 dead; ? saved.
Removed from Navy List:		10.03.1944
Commanding Officers:
?		?
Okitsu Maru 興津丸ツキオ		AP
Type: Transport
Builder: Harima Shipbuilding & Engineering Co., Aioi
Owner: Nippon Yusen Co.
Call Sign: JGFM
Official Number: 46267
Laid Down:		25.08.1938
Launched:		09.08.1939
Completed as passenger/cargo ship (6,666 GRT):		15.10.1939
Service:
Civilian, NYK Line		15.10.39–20.09.41
Requisitioned		12.09.1941
Hiroshima. Converted to navy auxiliary		12.09.41–22.10.41
Kure ND		20.09.41–01.12.41
Supply Unit, Combined Fleet		01.12.41–10.03.44
Fate: Sunk 26.01.44 by USS Skipjack (SS-184) ca. 146 nm north of Ponape, Carolines (09°24'N, 157°45'E). 176 dead; ? saved.
Removed from Navy List:		10.03.1944
Commanding Officers:
Capt Yoshida [?] (33)	吉田継輔	20.09.41–25.06.42
Capt Shimizu Ryutaro (36)	清水柳太郎	25.06.42–01.10.43
Otori Maru (I) 大鳥丸		AP
Type: Transport
Builder: Toledo Shipbuilding Co., Toledo, Ohio, USA
Call Sign: ?
Official Number: ?
Laid Down:		?
Launched as cargo ship S/S Lake Fillmore (2,560 GRT)		15.12.2019
Completed (2,559 GRT):		01.05.2020
Service:
Civilian, US Shipping Board, Washington, DC as S/S Lake Fillmore		1920–1923
Renamed S/S Bridgetown		05.04.1905
Civilian, Colombian S/S Co., New York, USA as S/S Bridgetown		1923–1932
Colombian Navy as ARC Boyacá		1932–1941
Civilian, Wallem & Co., Shangahi (Panamanian Registry) as S/S Boyacá		1941–08.12.41
Captured in Shanghai		08.12.1941
IJN as Otori Maru		08.12.41–14.12.43
Fate: Sunk 14.12.43 off Chinnampo, Korea in bad weather (38°43'N, 125°24'E).
Removed from Navy List:		?
Commanding Officers:
?		?
Otori Maru (II) 大鳥丸		AP
Type: Transport
Builder: Toledo Shipbuilding Co., Toledo, Ohio, USA
Owner: Kita Nippon Steamship Co.
Call Sign: JYMR
Official Number: 49895
Laid Down:		?
Launched:		01.12.1942
Completed as cargo ship (2,105 GRT):		17.03.1943
Service:
Civilian, Kita Nippon Steamship		17.03.43–01.01.44
Requisitioned		01.01.44
?		01.01.44–10.11.44
Fate: Sunk 20.05.44 by USS Angler (SS-240) E of Malaya, (05°40'S, 105°27'E).
Removed from Navy List:		10.11.1944
Commanding Officers:
?		?
Paran Maru 巴蘭丸		AP
Type: Transport
Builder: Hong Kong & Whampoa Dock Co., Hong Kong
Call Sign: JWAY
Official Number: —
Laid Down:		?
Launched:		01.12.2027
Completed as coaster M/S Palawan (562 GRT):		11.04.1905
Service:
Civilian, M/S Palawan Inc., Manila, Philippines		1928–1939
Civilian, Madrigal & Co., Manila, Philippines		1939–29.12.41
Scuttled in Manila Bay, Philippines		29.12.1941
Raised and repaired by Japanese. Commissioned as Paran Maru		01.01.1943
?		01.01.43–10.12.44
Fate: Sunk 30.01.44 by USS Burns (DD-588) off Kwajalein, Marshalls (08°42'N, 167°44'E).
Removed from Navy List:		10.12.1944
Commanding Officers:
?		?
Rakuto Maru 洛東丸ンザイラ		AP
Type: Transport
Builder: Osaka Shipbuilding Co., Osaka
Call Sign: JZMH
Official Number: 40887
Laid Down:		13.04.1935
Launched:		20.07.1935
Completed as cargo ship (2,962 GRT):		15.09.1935
Service:
Civilian, Osaka Shosen Co.		15.09.35–1937
Requisitioned by Army, Ship No. 134		1937–12.08.39
Civilian, Toa Shipping Co.		12.08.39–10.11.41
Requisitioned by IJN		10.11.1941
Sasebo ND		19.11.41–10.04.42
Converted to navy auxiliary		19.11.41–01–12.41
Kure ND		10.04.42–10.11.44
Fate: Sunk 12.09.44 by aircraft of US Navy TF 38 off Mactan Is., Cebu, Philippines (10°20'N, 124°20'E). 199 dead; ? saved.
Removed from Navy List:		10.11.1944
Commanding Officers:
?		?
Risui Maru 利水丸イスリ		AP
Type: Transport
Builder: Scotts' Shipbuilding & Engineering Co Ltd, Greenock, Scottland
Call Sign: JWYY
Official Number: —
Laid Down:		?
Launched:		01.03.2027
Completed as cargo ship (914 GRT):		24.03.2027
Service:
Civilian, Straits Steamship Co. Ltd., Singapore as S/S Lipis		24.03.27–1941
Civilian, Singapore Straits Steamship Co. Ltd., Singapore as S/S Lipis		1941–1941
British Royal Navy as HMS Lipis.		12.41–11.02.42
Attacked by aircraft Japanese at Sultan Shoal near Singapore and abandoned on fire.		11.02.1942
Raised and repaired by Japanese and commissioned as Risui Maru		31.10.43–25.05.45
Fate: Sunk 25.05.45 by HMS Venus (R.50), HMS Verulam (R.28) and HMS Virago (R.75) (26th Destroyer Division) in the Andaman Sea, E of Khota Andaman, Malaya (10°35'N, 94°45'E).
Removed from Navy List:		25.05.1945
Commanding Officers:
?		?
Ryuko Maru 隆興丸ウコウリュ		AP
Type: Transport
Builder: Asano Shipbuilding Co, Tsurumi-ku, Yokohama
Owner: Taiyo Kogyo Co.
Call Sign: JDHR
Official Number: 48986
Laid Down:		10.03.1941
Launched:		18.12.1941
Completed as cargo ship (2,764 GRT):		16.03.1942
Service:
Civilian, Taiyo Kogyo Co.		16.03.42–15.07.43
Chartered by Navy		15.07.43–01.01.44
Requisitioned		01.01.1944
Sasebo ND		01.01.44–30.03.44
Fate: Sunk 30.03.44 by aircraft from US Navy TF 38 off Palau, Carolines (07°30'N, 134°30'E). 5 dead; ? saved.
Removed from Navy List:		30.04.1944
Commanding Officers:
Capt Katabuchi Jousaku (M)	片渕定作	1944–
Sansei Maru 山西丸イセンサ		AP
Type: Transport
Builder: Mitsui Engineering & Shipbuilding, Tamano
Owner: Dairen Steamship Co., Dairen, Manchuria.
Call Sign: JKTA
Official Number: K 412
Laid Down:		06.12.1930
Launched:		14.05.1931
Completed as cargo ship (3,266 GRT):		30.06.1931
Service:
Civilian, Dairen Steamship Co		30.06.31–24.04.41
Chartered by Navy		24.04.1941
Converted to navy auxiliary		24.04.41–03.06.41
Requisitioned by Navy		15.10.1941
Sasebo ND		15.10.41–10.04.42
Yokosuka ND		10.04.42–05.02.44
Fate: Badly damaged 08.12.43 by USS Sawfish (SS-276). 0 dead. Sinks 12.03.44 while under repair at Chichi-Jima, Bonin Islands. (25°20'N, 141°46'E).
Removed from Navy List:		05.02.1944
Commanding Officers:
?		?
Seizan Maru 晴山丸		AP
Type: Transport
Builder: Namura Heavy Shipbuilding Industries Co., Osaka
Call Sign: JQTE
Official Number: 22270
Laid Down:		31.03.1905
Launched:		17.08.1932
Completed as cargo ship Seizan Maru No. 2 (955 GRT)		01.04.1905
Service:
Civilian,
Civilian, Yamamoto Steamship
Requisitioned as Seizan Maru		08.10.1941
Yokosuka ND		08.10.41–25.08.42
Sasebo ND		25.08.42–01.11.43
Fate: Sunk 20.08.43 by USS Gar (SS-206) in the Makassar Strait, 5 nm SE Borneo (00°58'N, 119°00'E). 12 dead; ? saved.
Removed from Navy List:		01.11.1943
Commanding Officers:
?		?
Seizan Maru No. 2 第2青山丸ンザイセ		AP
Type: Transport
Builder: Matsuo Tekkosho Co.
Owner: Taiko Steamship Co.
Call Sign: JTFL
Official Number: 42961
Laid Down:		01.08.1936
Launched:		13.02.1937
Completed (1,898 GRT):		01.06.1937
Service:
Civilian, Taiko Steamship Co.		06.37–1937
Requisitioned by IJN		1937–1939
Civilian, Taiko Steamship Co.		1939–17.07.42
Requisitioned		17.07.1942
Maizuru ND		20.07.42–05.02.44
Converted to navy auxiliary		20.07.42–31.07.42
Fate: Sunk 24.12.43 at 07:50 by USS Gunnard (SS-254) in the Kumano Sea, 27 nm E of Miki Cape, Honshu, Japan (33°57'N, 136°19'E). 28 dead; ? saved.
Removed from Navy List:		05.02.1944
Commanding Officers:
?		?
Senko Maru 三興丸サンコウ		AP
Type: Transport
Builder: Yokohama Dock Co., Yokohama
Call Sign: JYRJ
Official Number: 40758
Laid Down:		12.09.1934
Launched:		18.05.1935
Completed as cargo ship (4,472 GRT):		31.07.1935
Service:
Civilian, Kinkai Yusen Co.		31.07.35–08.09.39
Civilian, Nippon Yusen Co.		08.09.39–21.08.41
Requisitioned		21.08.1941
Sasebo ND		20.09.41–14.11.41
Innoshima. Converted to navy auxiliary		20.09.41–14.11.41
Fifth Fleet		14.11.41–03.42
SW Area Fleet		03.42– 01.02.44
2nd South Exp Fleet		01.02.44–09.45
Fate: Badly damaged 23.07.45 by British Navy FAA aircraft in Boengos Bay, S of Padang, Sumatra, and beached. Towed 01.09.45 to Padang. Seized 11.10.45 by Indonesian rebels. Bombed and sunk 03.11.45 by Dutch aircraft.
Removed from navy List:		03.05.1947
Commanding Officers:
Capt Sato Bunkichi (36)	佐藤文吉	20.09.41–15.12.42
Cdr Yamamoto Masaichi(34)	山本雅一	15.12.42–
Capt Tominaga Kisaburo (M)		–11.45
Senzan Maru 千山丸ンザンセ		AP
Type: Transport
Builder: Mitsui Engineering & Shipbuilding, Tamano
Owner: Dairen Steamship Co., Dairen, Manchuria.
Call Sign: JPXC
Official Number: K 332
Laid Down:		26.12.2028
Launched:		25.05.2029
Completed as cargo ship (2,775 GRT):		01.07.2029
Service:
Civilian, Dairen Steamship Co.		01.07.29–10.08.42
Requisitioned		02.08.1942
Maizuru. Converted to navy auxiliary		08.08.42–20.08.42
Combined Fleet		10.08.42–01.11.42
SE Area Fleet		01.11.42–01.04.43
Fate: Sunk 18.01.43 by US aircraft off Kavieng, New Ireland, Bismarcks (03°29'S, 149°02'E). 7 dead; ? saved.
Removed from Navy List:		01.04.1943
Commanding Officers:
?		?
Shinkoku Maru 神国丸クコンシ		AP
Type: Transport
Builder: Osaka Shipbuilding Co.
Owner: Naigai Steamship Co.
Call Sign: JYPN
Official Number: 47567
Laid Down:		?
Launched:		24.02.1940
Completed (3.991 GRT):		12.10.1940
Service:
Civilian, Naigai S/S Co.		12.10.40–18.02.42
Requisitioned		18.02.1942
Maizuru ND		25.02.42–01.03.42
11th Air Fleet		01.03.42–01.11.42
SE Area Fleet		01.11.42–01.04.43
Fate: Sunk 20.02.43 by USS Halibut (SS-232) about 280 nm NW Eniwetok, Marshalls (15°09'N, 159°30'E). ? dead; 0 saved.
Removed from Navy List:		01.04.1943
Commanding Officers:
?		?
Shinryu Maru 神龍丸シンリュウ		AP
Type: Transport
Builder: Osaka Shipbuilding Co., Osaka
Owner: Nagai Steamship Co.
Call Sign: JTBL
Official Number: 42949
Laid Down:		01.09.1936
Launched:		13.03.1937
Completed as cargo ship (4,935 GRT):		18.05.1937
Service:
Civilian, Nagai Steamship Co.		18.05.37–
Requisitioned by Army		1937–
Civilian, Nagai Steamship Co.		–10.11.41
Chartered by Navy		31.12.40–10.11.41
Requisitioned by Navy		10.11.1941
Yokosuka ND		10.11.41–15.05.42
Civilian, Nagai Steamship Co.		15.05.1942–25.04.43
Requisitioned by Army		25.04.1943
Army		26.06.43–29.06.43
Fate: Wrecked 29.06.43 off Matsuwa, Kuriles (48°06'N, 153°15'E). 129 dead; ? saved.
Commanding Officers:
?		?
Shinsei Maru No. 18 第十八眞盛丸		AP
Type: Transport
Builder: Mitsubishi Heavy Industries, Kobe
Owner: Hara Shoji Co.
Call Sign: JNHP
Official Number: 48507
Laid Down:		25.09.1940
Launched:		15.03.1941
Completed cargo ship (2,711 GRT):		31.07.1941
Service:
Civilian, Hara Shoji Co.		31.07.41–
Requisitioned		24.02.1942
Maizuru ND		25.02.42–01.03.42
Supply Unit, 11th Air Fleet		01.03.42–01.10.42
SE Area Fleet		01.10.42–30.04.42
Fate: Sunk 30.03.44 by USN aircraft at Palau, Carolines (07°30'N, 134°30'E). 7 dead; ? saved.
Removed from Navy List:		30.04.1942
Commanding Officers:
?		?
Shinyo Maru 神陽丸シンヨウ		AP
Type: Transport
Builder: Harima Shipbuilding & Engineering Co., Aioi
Owner: Shinyo Steamship Co.
Call Sign: JHRL
Official Number: 44156
Laid Down:		06.07.1937
Launched:		17.01.1938
Completed as cargo ship (4,163 GRT):		25.03.1938
Service:
Civilian, Shinyo S/S Co.		25.03.38–26.07.41
Requisitioned		26.07.1941
Sasebo ND		15.10.41–10.08.42
Fate: Sunk 13.07.42 at 07:55 by USS Seadragon (SS-194) in the South China Sea, 15 nm NE Cape Varella, Indochina (13°04'N, 109°39'E). 1 dead; ? saved.
Removed from Navy List:		10.08.1942
Commanding Officers:
?		?
Shinyo Maru No. 8 第8信洋丸ウヨンシ		AP
Type: Transport
Builder: Mukaishima Dock Co.
Owner: Okada Shipping Co.
Call Sign: JCMP
Official Number: 46871
Laid Down:		10.02.1940
Launched:		17.11.1940
Completed (,1959 GRT):		01.02.1941
Service:
Civilian, Okada Shipping Co.		01.02.41–20.07.42
Requisitioned		20.07.1942
Yokosuka ND		20.07.42–10.01.45
Fate: Sunk 07.10.44 by USS Cabrilla (SS-288) in the South China Sea, NW of Luzon, Philippines (17°50'N, 119°37'E). 44 dead; 0 saved.
Removed from Navy List:		10.01.1945
Commanding Officers:
?		?
Shirogane Maru 志ろがね丸ネガロシ		AP
Type: Transport
Builder: Harima Shipbuilding & Engineering Co., Aioi
Owner: Nippon Shipping Co.
Call Sign: JHZL
Official Number: 45454
Laid Down:		23.07.1938
Launched:		31.10.1938
Completed (3,130 GRT):		10.12.1938
Service:
Civilian, Nippon Shipping Co.		10.12.38–15.10.41
Chartered by Navy		25.01.40–15.10.41
Requisitioned		15.10.1941
Yokosuka ND		15.10.41–10.04.42
Yokosuka. Converted to navy auxiliary		15.10.41–03.11.41
Sasebo ND		10.04.42–19.09.42
Fate: Badly damaged 20.09.42 by USS Amberjack (SS-219). Grounded at Buin (06°33'S, 156°05'E) to prevent sinking. Abandoned 16.10.42 . 3 dead; ? saved.
Removed from Navy List:		30.06.1945
Commanding Officers:
Capt Sasaki Sannosuke (M)		27.01.40.?
Shoan Maru 松安丸		AP
Type: Transport
Builder: Tama Shipyard, Tamano
Owner: Matsuoka Steamship Co.
Call Sign: JYOL
Official Number: 43731
Laid Down:		10.07.1937
Launched:		21.10.1937
Completed as cargo ship (5,624 GRT):		30.11.1937
Service:
Civilian, Matsuoka S/S Co.		30.11.37–20.09.41
Converted to navy auxiliary		05.09.41–14.10.41
Requisitioned		20.09.1941
Kure ND		20.09.41–10.04.42
Fate: Badly damaged 27.01.43 by USS Whale (SS-239) about 400 nm E of Saipan, Marianas (04°24'N, 153°30'E). Towed to Saipan. Sunk on 23.02.44 by aircraft from USS Essex (CV-9) off Garapan at Saipan.
Removed from Navy List:		10.04.1942
Commanding Officers:
?		?
Shoei Maru 昭榮丸		AP
Type: Transport
Builder: William Gray & Co., Sunderland, England
Call Sign: JCDC
Official Number: 33589
Laid Down:		?
Launched:		18.11.2019
Completed as cargo ship S/S War Oasis (3,083 GRT):		19.02.1919
Service:
Civilian, The Shipping Controller as S/S War Oasis		1919–1919
Civilian, Ashwin & Co., London, England as S/S Oakwin		1919–1920
Civilian, Oakwin S.S. Co. (Sir W. Reardon Smith), London, England		1920–1922
Civilian, Sir W. Reardon Smith, London, England		1922–1925
Renamed General Lukin		06.04.1925
Civilian, Oakwin S/S Co. (Sir W. Reardon Smith), London, England		1925–1927
Civilian, St. Just S/S Co. (Sir W. Reardon Smith), London, England		1927–1928
Civilian, Shoyei S/S Co. (Towa S/S Co.), Tarumi as Shoyei Maru		1928–1936
Civilian, Towa S/S Co., Tarumi as Syoei Maru		1936–1942
Requisitioned		10.04.1942
Yokosuka ND		10.04.1942–05.02.44
Fate: Sunk 20.12.43 by US aircraft at Kwajalein. 5 dead; ? saved.
Removed from Navy List:		05.02.1944
Commanding Officers:
?		?
Shohei Maru 昌平丸		AP
Type: Transport
Builder: Mitsui Engineering & Shipbuilding, Tamano
Owner: Shimatani Steamship
Call Sign: JJTC
Official Number: 36558
Laid Down:		03.06.1930
Launched:		24.01.1931
Completed as cargo ship (7,255 GRT):		25.03.1931
Service:
Civilian, MBK Lines		25.03.31–20.09.41
Requisitioned		20.09.1941
Kure ND		20.09.41–10.07.44
Kure. Conversion to navy auxiliary		14.09.41–06.10.41
Fate: Sunk 10.05.44 sunk at 07:30 by USS Cod (SS-224) in the South China Sea, 27 nm W of Masinloc, Luzon (15°38'N, 119°32'E). 20 dead; ? saved.
Removed from Navy List:		10.07.1944
Commanding Officers:
Capt Tanaka Masaji (34)	田中政治	20.09.41–27.09.43
Capt Ooe Iwajiro (M)	大江　岩次郎	27.09.43–01.10.43
Capt Takezaki Takeo (37)	竹崎武雄	01.10.43–08.10.43
Capt Shirane Toshio (M)	白根敏雄	08.10.43–10.05.44
Shoho Maru 昌宝丸ウホウショ		AP
Type: Transport
Builder: Mitsui Engineering & Shipbuilding, Tamano
Owner: Shimatani Steamship Co.
Call Sign: JNVL
Official Number: 42944
Laid Down:		03.12.1936
Launched:		11.03.1937
Completed as cargo ship (1,936 GRT):		15.04.1937
Service:
Civilian, Shimatani S/S Co.		15.04.37–01.01.44
Requisitioned		01.01.1944
Maizuru ND		01.01.44–20.09.44
Fate: Sunk 31.12.43 by USS Greenling (SS-213) in the eastern Carolines [before registration with Maizuru ND] (05°18'N, 160°20'E). 20 dead; 106 saved.
Removed from Navy List:		20.09.1944
Commanding Officers:
Capt Tsunado Shinzo	綱頭新造	30.10.43–
Shoka Maru 彰化丸カショ		AP
Type: Transport
Builder: Mitsubishi Heavy Industries, Nagasaki
Owner: Osaka Shosen Co.
Call Sign: JZLH
Official Number: 41167
Laid Down:		29.11.1934
Launched:		31.08.1935
Completed as cargo ship (4,467 GRT):		15.11.1935
Service:
Civilian, OSK Line		15.11.35–1938
Requisitioned by Army		1938–1939
Civilian, OSK Line		1939–20.09.41
Requisitioned by IJN		07.08.1941
Sasebo ND		20.09.41–10.04.42
Converted to navy auxiliary		11.41–01.12.41
Fate: Sunk 25.05.42 at 18:40 by USS Tautog (SS-199) ca. 190 nm S of Woleai, Carolines (04°07'N, 143°32'E). 3 dead; 62 saved.
Removed from Navy List:		10.04.1942
Commanding Officers:
?		?
Shokei Maru 昭慶丸イケショ		AP
Type: Transport with strengthened hull for ice navigation
Builder: Naniwa Dock Co., Osaka
Owner: Towa Steamship Co.
Call Sign: JLHM
Official Number: 44597
Laid Down:		?
Launched:		16.02.1938
Completed (2,557 GRT):		06.05.1938
Service:
Requisitioned		10.09.1938
Kure ND		10.09.38–01.04.39
Civilian, Towa S/S Co.		01.04.39–15.10.41
Requisitioned		15.10.1941
Sasebo ND		15.10.41–10.11.44
Fate: Sunk 08.09.44 by USS Spadefish (SS-411) E of Taiwan (24°45'N, 123°20'E). 2 dead; ? saved
Removed from Navy List:		10.11.1944
Commanding Officers:
Capt Naotsuka Hachiro (38)	直塚八郎	10.09.38–01.12.38
Capt Nakamura Hideyoshu (34)	中村秀吉	01.12.38–27.01.39
Capt Tsuda Gensuke (38)	津田源助	27.01.39–
Capt Sakakura Sotaro (??)		14.09.40–
Shoko Maru 松江丸		AP
Type: Transport
Builder: Harima Shipbuilding & Engineering Co., Aioi
Owner: Dairen Steamship Co., Dairen, Manchuria.
Call Sign: JQYG
Official Number: K 785
Laid Down:		12.05.1939
Launched:		09.12.1939
Completed as cargo ship (5,385 GRT):		10.03.1940
Service:
Civilian, Dairen Steamship Co.		10.03.40–30.10.41
Requisitioned		30.10.1941
Sasebo ND		30.10.41–10.04.42
Civilian, Dairen Steamship Co.		10.04.42–29.05.43
Fate: Sunk 29.05.43 by USS Saury (SS-189) in East China Sea (29°50'N, 129°35'E). 61 dead; 0 saved.
Commanding Officers:
?		?
Shoun Maru 松運丸ンウウショ		AP
Type: Transport
Builder: Mitsui Engineering & Shipbuilding, Tamano
Owner: Matsuoka Steamship
Call Sign: JBCP
Official Number: 47979
Laid Down:		29.05.1940
Launched:		13.03.1941
Completed cargo ship (4,396 GRT):		27.06.1941
Service:
Requisitioned		15.11.1941
Sasebo ND		15.11.41–15.05.42
Reclassified as General Transport		15.05.1942
Yokosuka ND		15.05.42–28.05.42
Returned to Owners		28.05.1942
Requisitioned		15.08.1943
Yokosuka ND		28.05.42–23.06.44
Fate: Sunk 23.06.44 by US aircraft off Rota, Marianas (14°10'N, 145°10'E). 6 dead; ? saved.
Removed from Navy List:		15.05.1942
Commanding Officers:
?		?
Shunten Maru 春天丸		AP
Type: Transport
Builder: Mitsui Engineering & Shipbuilding, Tamano
Owner: Daido Shipping
Call Sign: JCAC
Official Number: 33588
Laid Down:		18.01.2028
Launched:		20.06.2028
Completed as passenger/cargo-ship (5,623 GRT):		06.08.2028
Service:
Civilian, Yamamoto Shoji, Osaka		06.08.28–1940
Civlian, Yamato Maritime Co., Kobe		1940–15.10.41
Requisitioned by IJN		15.10.1941
Kure ND		15.10.41–10.04.42
Civilian, Daido Shipping, Kobe		10.04.42–12.12.42
Requisitioned by IJN		12.12.1942
Kure ND		12.12.42–01.09.43
Kute. Converted to tanker		12.12.42–09.01.43
Civilian, Shipping Control Board		01.09.43–17.11.44
Fate: Sunk 17.11.44 at 05:00 USS Gunnel (SS-253) in the South China Sea, 130 nm E of Tourane, Indochina (16°45'N, 110°15'E).
Commanding Officers:
?		?
Suiten Maru 水天丸		AP
Type: Transport
Builder: Maatschappij Fijenoord Ltd., Rotterdam, Netherlands
Call Sign: JWGY
Official Number:
Laid Down:		?
Launched:		02.12.2015
Completed as passenger/cargo ship S/S Schouten (1,805 GRT):		13.04.2012
Service:
Civilian, KPM Line		13.04.12–13.03.41
Civilian, Netherland Line (SMN)		13.03.41–07.12.41
Requisitioned by Royal Netherlands Navy as air defense ship Hr.Ms. Schouten		07.12.1941
RNN		07.12.41–28.02.42
Scuttled by own crew at Soerabaja		28.02.1942
Raised, repaired, renamed as Suiten Maru		15.11.1942
Fate: Sunk 03.03.45 by USS Sea Robin (SS407) in the Java Sea, off Malang, Java (06°34'S, 113°01'E).
Removed from Navy List:		03.05.1947
Commanding Officers:
Capt Oki Senjiro (M)	沖　専次郎	02.11.43–
Suwa Maru 諏訪丸ワス		AP
Type: Transport
Builder: Mitsubishi Heavy Industries, Nagasaki
Owner: Nippon Yusen
Call Sign: JSUD
Official Number: 17308
Laid Down:		28.10.2012
Launched:		29.03.2014
Completed as passenger/cargo ship (10,672 GRT):		10.09.2014
Service:
Civilian, NYK Line		10.09.14–29.08.37
Requisitioned by Army, Ship No. 330		29.08.37–09.01.38
Civilian, NYK Line		09.01.38–08.07.41
Requisitioned by Army, No. 330		08.07.41–18.04.42
Civilian, NYK Line		18.04.42–10.08.42
Requisitioned		10.08.1942
Kure ND		10.08.42–01.07.43
Fate: Beached and wrecked on 28.03.43 after attack by USS Tunny (SS-282) off Wake Island (19°13'N, 166°34'E). 15 dead; ? saved.
Removed from Navy List:		01.07.1943
Commanding Officers:
?		?
Taijun Maru 大順丸		AP
Type: Transport
Builder: Uchida Shipbuilding Co., ISe
Owner: Hachiuma Steamship
Call Sign: JARB
Official Number: 23072
Laid Down:		01.04.1905
Launched:		24.11.2096
Completed as cargo ship (1,274 GRT)		01.04.1905
Service:
Civilian, Nagasaki Shipping Co.		1918–1923
Civilian, Japan Salt Manufacturing Co.		1923–1928
Civilian, OSK Line		1928–02.03.38
Civilian, Hachiuma Steamship Co.		02.03.38–06.12.41
Requisitioned		06.12.1941
Yokosuka ND		06.12.41–16.12.41
Converted to navy auxiliary		06.12.41–15.12.41
4th Fleet		16.12.41–01.05.42
Fate: Badly damaged 11.04.42 by USAF aircraft; scuttled off Lae Harbor, New Guinea. (06°49'N, 147°02'E). 3 dead; ? saved.
Removed from Navy List:		01.05.1942
Commanding Officers:
?		?
Tairyu Maru 太隆丸		AP
Type: Transport
Builder: Kawaminami Heavy Industries, Koyagi Yard
Owner: Taiko Steamship Co.
Call Sign: JYBN
Official Number: 46911
Laid Down:		?
Launched:		13.09.1939
Completed cargo ship (1,912 GRT):		04.03.1940
Service:
Civilian, Taiko Steamship Co.		04.03.40–05.09.40
Requisitioned		05.09.1940
Yokosuka ND		05.09.40–10.06.45
Fate: Sunk 17.05.45 by mine 3 nm SE Wada Misaki lighthouse (34°36'N, 135°13'E). 1 dead; ? saved.
Removed from Navy List:		10.06.1945
Commanding Officers:
?		?
Taito Maru 臺東丸ウトイタ		AP
Type: Transport
Builder: Mitsubishi Heavy Industries, Nagasaki
Owner: Osaka Merchant Marine Co.
Call Sign: JZTH
Official Number: 40879
Laid Down:		01.11.1934
Launched:		18.06.1935
Completed cargo ship (4,466 GRT):		30.09.1935
Service:
Civilian, OSK Line		30.09.35–07.37
Requisitioned by Army, Ship No. 64		07.37–1941
Requisitioned by Navy		01.11.1941
Kure ND		10.11.41–10.04.42
Civilian, OSK Line		10.04.42–15.04.42
Chartered by Navy		15.04.42–13.10.42
Requisitioned by Navy		13.10.1942
Kure ND		13.10.42–30.06.44
Fate: Sunk 25.05.44 at 09:25 by USS Flying Fish (SS-229) ca. 200 nm of Yap (11°12'N, 135°14'E). 18 dead; ? saved.
Removed from Navy List:		30.06.1944
Commanding Officers:
Capt Sato Mamoru (M)	佐藤　護	01.11.41–05.11.41
Capt Ito Kenkichi (M)	伊藤兼吉	05.11.41–
Tamashima Maru 玉島丸マシマタ		AP
Type: Transport
Builder: Mitsubishi Heavy Industries, Yokohama
Call Sign: JSHO
Official Number: 47585
Laid Down:		06.12.1939
Launched:		03.10.1940
Completed as passenger/cargo ship (3,560 GRT):		14.12.1940
Service:
Civilian, Iino Steamship Co.		14.12.40–13.03.41
Civilian, Iino Sangyo Shipping Co.		13.03.41–13.08.41
Requisitioned		13.08.1941
Kure ND		05.10.41–10.03.44
Kure. Converted to navy auxiliary		05.10.41–20.10.41
Fate: Sunk 30.01.44 by USS Spearfish (SS-190) about 300 nm E of Uracas, Marianas (21°12'N, 149°28'E). 4 dead; ? saved.
Removed from Navy List:		10.03.1944
Commanding Officers:
Capt Matsumoto Rihee (M)	松本　利兵衛	1941–
Tarushima Maru たるしま丸マシルタ		AP
Type: Transport
Builder: Osaka Shipbuilding, Osaka
Owner: Hamane Shoten Co.
Call Sign: JYJL
Official Number: 44142
Laid Down:		25.10.2014
Launched:		21.09.1937
Completed as cargo ship (4,865 GRT):		15.02.1938
Service:
Civilian: Hamane Shoten Co.		15.02.38–25.07.41
Requisitioned		25.07.1941
Sasebo ND		25.07.41–10.04.42
Kure ND		10.04.42–10.03.45
Fate: Sunk 07.11.44 by USS Whale (SS-239) in Philippine Sea (23°00'N, 135°10'E). 633 dead; ? saved.
Removed from Navy List:		10.03.1945
Commanding Officers:
Capt Sota Eiichi (M)	曽田榮一	04.42–
Tatebu (Kembu) Maru 建武丸		AP
Type: Transport
Builder: Taikoo Dockyard & Engineering Co., Hong Kong
Owner:
Call Sign: JWOY
Official Number:
Laid Down:		01.05.1941
Completed as cargo ship S/S Empire Blossom (6,816 GRT):
Service:
Captured at Hong Kong ready for launching		01.12.1941
Completed by Japanese as Tatebu Maru		15.03.2003
?		15.03.03–05.02.44
Fate: Sunk 05.12.43 by aircraft from USS Lexington (CV-16) at Roi, Kwajalein (09°22'N, 167°27'E).
Removed from Navy List:		05.02.1944
Commanding Officers:
?		?
Tatsuho Maru 辰鳳丸		AP
Type: Transport
Builder: Mitsubishi Heavy Industries, Kobe
Owner: Tatsuma Goshi Co.
Call Sign: JCTM
Official Number: 44591
Laid Down:		02.08.1937
Launched:		19.01.1938
Completed cargo ship (6,334 GRT):		30.04.1938
Service:
Civilian, Tatsuma Goshi Co.		30.04.38–17.04.41
Requisitioned		17.04.1941
Kure ND		10.05.41–15.09.42
Fate: Sunk 22.08.42 at 13:15 by USS Haddock (SS-231) in the East China Sea, 18 nm N of Taiwan (25°52'N, 121°29'E). 38 dead; ? saved.
Removed from Navy List:		15.09.1942
Commanding Officers:
Capt Tsujita Shoichi (38)	辻田正一	10.05.41–17.08.42
Capt Kita Seiichiro (34)	北　正一郎	17.08.42–22.08.42
Tatsutagawa Maru 龍田川丸ワガタツタ		AP
Type: Transport
Builder: Kawaminami Heavy Industries Co., Koyagi
Owner: Toyo Shipping Co.
Call Sign: JWGO
Official Number: 48734
Laid Down:		07.05.1940
Launched:		24.07.1941
Completed as cargo ship (1,923 GRT):		10.09.1941
Service:
Civilian, Toyo Shipping Co.		10.09.41–20.07.42
Requisitioned		20.07.1942
Yokosuka ND		20.07.42–10.09.44
Fate: Sunk 15.06.44 by USS Boyd (DD-544) and USS Charrette (DD-581) E of Ogasawara Shoto, Bonins (25°02'N, 144°37'E). 17 dead; ? saved.
Removed from Navy List:		10.09.1944
Commanding Officers:
?		?
Tatsuwa Maru 辰和丸ワツタ		AP
Type: Transport
Builder: Mitsubishi Heavy Industries, Kobe
Owner: Tatsuwa Goshi Co.
Call Sign: JCEM
Official Number: 44140
Laid Down:		01.05.1937
Launched:		22.09.1937
Completed as cargo ship (6,335 GRT):		01.02.1938
Service:
Civilian, Tatsuwa Goshi		01.02.38–16.12.40
Requisitioned		16.12.1940
Sasebo ND		16.12.40–
Fate: Sunk 10.05.45 by mine dropped by USAAF 20th Air Force in the Tsushima Strait off Shimonoseki, Honshu, Japan. Salvaged 1946. Sunk 10.05.54 during typhoon.
Removed from Navy List:		10.06.1945
Commanding Officers:
Capt Shibuya Shunsaku (36)	渋谷週作	07.05.41–01.09.41
Capt Inoue [?] (35)	井上達六	01.09.41–15.11.42
Capt Kusuoka Junichi (36)	楠岡準一	15.11.42–
Tenryu Maru 天龍丸		AP
Type: Transport
Builder: Osaka Shipbuilding Co., Osaka
Owner: Naigai Steamship Co.
Call Sign: JGZL
Official Number: 42623
Laid Down:		09.06.1936
Launched:		15.11.1936
Completed as cargo ship (4,861 GRT):		28.12.1936
Service:
Civilian, Naigai Steamship Co.		28.12.36–15.11.41
Requisitioned		15.11.1941
Kure ND		15.11.41–05.02.44
Fate: Sunk 25.12.43 by aircraft from USS Bunker Hill (CV-17) and USS Monterey (CVL 26) at Kavieng (02°36'S, 150°49'E). 5 dead; ? saved.
Removed from Navy List:		05.02.1944
Commanding Officers:
?		?
Tenzan Maru 天山丸ンサンテ		AP
Type: Transport
Builder: Mitsui Engineering & Shipbuilding, Tamano
Owner: Dairen Steamship Co., Dairen, Manchuria.
Call Sign: JPTC
Official Number: K 323
Laid Down 22.10.28
Launched:		02.03.2029
Completed as cargo ship (2,775 GRT):		28.05.2029
Service:
Civilian, Dairen S/S Co.		28.05.29–22.12.41
Requisitioned		22.12.1942
Kure ND		22.12.42–10.01.42
Converted to navy auxiliary		30.12.41–14.01.42
11th Air Fleet		10.01.42–31.07.42
Fate: 08.07.42 by USS S-37 (SS-142) in the Bismarck Sea, 30 nm W of Rabual (04°00'S, 151°50'E). 82 dead; ? saved.
Removed from Navy List:		31.07.1942
Commanding Officers:
?		?
Toa Maru No. 2 Go 第二號東亞丸		AP
Type: Transport
Builder: Kawaminami Heavy Industries, Koyagi Yard
Owner: Osaka Merchant Marine Co.
Call Sign: JPOM
Official Number: 45791
Laid Down:		03.12.1937
Launched:		08.12.1938
Completed as passenger/cargo ship Toa Maru (6,732 GRT):		31.07.1939
Service:
Civilian, OSK Line		31.07.39–18.08.41
Requisitioned		18.08.1941
Yokosuka ND		18.08.41–15.08.41
Kobe. Converted to navy auxiliary as Toa Maru No. 2 Go		24.12.41–16.01.42
Sasebo ND		15.08.41–01.04.43
Fate: Sunk 30.01.43 by aircraft from USMC VSMB-233 in the Solomon Sea N of Gizo, Solomons (07°43'S, 156°51'E). 3 dead; ? saved.
Removed from Navy List:		01.04.1943
Commanding Officers:
?		?
Toei Maru 藤影丸イエウト		AP
Type: Transport
Builder: Kawasaki Shipbuilding Co, Kobe
Owner: Yamamoto Steamship Co.
Call Sign: JNWL
Official Number: 43205
Laid Down:		04.11.1936
Launched:		13.03.1937
Completed as cargo ship (4,004 GRT):		19.06.1937
Service:
Civilian, Yamamoto Steamship Co.		19.06.37–
Rquisitioned by Army, Ship No. 542		1938–1939
Civilian, Yamamoto Steamship Co.		1939–16.07.41
Yokosuka ND		16.07.41–24.06.43
Ominato Guard District		24.06.43–31.03.44
Fate: Sunk 01.02.44 by USS Seahorse (SS-304) about 175 nm S of Woleai, Carolines (04°24'N, 143°15'E). 56 dead; ? saved.
Removed from Navy List:		31.03.1944
Commanding Officers:
?		?
Tokai Maru 東海丸イカウト		AP
Type: Transport
Builder: Mitsubishi Heavy Industries, Nagasaki
Owner: Osaka Merchant Marine Co.
Call Sign: JJJC
Official Number: 36099
Laid Down:		26.11.2029
Launched:		15.05.1930
Completed as cargo ship (8,359 GRT):		14.07.1930
Service:
Civilian, OSK Line		14.07.30–12.10.41
Chartered by Navy		12.10.41–10.04.42
Requisitioned		10.04.1942
Kure ND:		10.04.42–01.12.43
Fate: Sunk 27.08.43 at 18:03 by USS Snapper (SS-185) at Apra Harbor, Guam (13°27'N, 144°37'E). 0 dead; ? saved.
Removed from Navy List:		01.12.1943
Commanding Officers:
?		?
Tokyo Maru 東京丸		AP
Type: Transport
Builder: Mitsui Engineering & Shipbuilding, Tamano
Owner: Settsu Merchant Marine Co.
Call Sign: JPVK
Official Number: 41929
Laid Down:		20.12.1935
Launched:		22.06.1936
Completed as cargo ship (6,481 GRT):		31.08.1936
Service:
Civilian, OSK Line.		31.08.36–1937
Requistioned by Army, as Ship No. 54		1937–1938
Civilian, OSK Line.		1938–09.08.41
Chartered by navy		09.08.41–31.12.41
Requisitioned by Navy		31.12.1941
Kure ND		31.12.41–10.04.42
Yokosuka ND		10.04.42–05.01.44
Fate: Badly damaged 10.11.43 by USS Scamp (SS-277) ca. 240 nm SSW of Truk, sunk 12.11.43 at 14:55 (05°42'N, 151°09'E). 3 dead; ? saved.
Removed from Navy List:		05.01.1944
Commanding Officers:
Capt Abe Heikichi (M)		20.08.38–
Capt Sato [?]		04.01.42–
?		?
Toyo Maru 東洋丸ヨト		AP
Type: Transport
Builder: Harima Shipbuilding & Engineering Co., Aioi
Owner: Sawayama Steamship
Call Sign: JHFL
Official Number: 42940
Laid Down:		08.09.1936
Launched:		24.01.1937
Completed as cargo ship (4,163 GRT):		09.04.1937
Service:
Civilian, OSK Line		09.04.37–09.10.37
Chartered by IJN		09.10.37–15.10.41
Requisitioned		15.10.1941
Sasebo ND		15.10.41–01.09.43
Fate: Sunk 26.06.43 by USS Jack (SS-259) off the Izu Islands, 20 nm W of Hachijo Jima (33°13'N, 139°30'E). 1 dead; ? saved.
Removed from Navy List:		01.09.1943
Commanding Officers:
?		?
Toyo Maru No. 2 第2東洋丸ヨト		AP
Type: Transport
Builder: Harima Shipbuilding & Engineering Co., Aioi
Owner: Sawayama Steamship Co.
Call Sign: JHLL
Official Number: 42989
Laid Down:		30.03.1937
Launched:		28.06.1937
Completed as cargo ship (4,162 GRT):		21.09.1939
Service:
Civilian, OSK Line		21.09.39–13.04.41
Chartered by navy		13.04.41–15.10.41
Requisitioned by Navy		15.10.1941
Yokosuka ND		15.10.41–02.04.43
Fate: Sunk 02.04.43 by USS Tunny (SS-289) ca. 5 nm W Puluwat Island, Carolines (07°22'N, 149°18'E). 51 dead; 1 saved.
Removed from Navy List:		01.05.1943
Commanding Officers:
Capt Hayakawa Goro (M)		11.41–
?		?
Toyosaka Maru とよさか丸カサヨト		AP
Type: Transport
Builder: Mukaishima Dock Co., Onomichi
Owner: Hamane Shoten Co.
Call Sign: JCDO
Official Number: 46933
Laid Down:		?
Launched:		27.01.1940
Completed as cargo ship (1,966 GRT):		22.06.1940
Service:
Civilian, Hamane Shoten Co.		22.06.40–04.12.41
Requisitioned by Navy		04.12.1941
Kure ND		04.12.41–10.04.42
Kure. Converted to navy auxiliary		22.12.41–11.01.42
Sasebo ND		10.04.42–10.05.45
Fate: Sunk 01.03.45 by aircraft from US Navy TF 58 some 20 nm S of Miyakojima (24°46'N, 125°30'E). 4 dead; ? saved.
Removed from Navy List:		10.05.1945
Commanding Officers:
?		?
Unyo Maru No. 2		AP
Type: Transport
Builder: Mitsui Shipbuilding Co Ltd., Tâmano
Owner: Nakamura Steamship Co.
Call Sign: JTQL
Official Number: 42971
Laid Down:		22.03.1937
Launched:		25.07.1937
Completed as cargo ship (2,827 GRT):		06.08.1937
Service:
Civilian, Nakamura Line		06.08.37–02.11.41
Requisitioned		02.11.1941
Yokosuka ND		02.11.41–15.01.42
Yokosuka. Converted to navy auxiliary		04.11.41–26.11.41
Fate: Sunk 26.12.41 by Dutch aircraft from 1-VI.G-I in the South China Sea, off Kuching, Sarawak (01°34'N, 110°21'E). 8 dead; ? saved.
Removed from Navy List:		15.01.1942
Commanding Officers:
?		?
Yamadori Maru 山鳥丸ヤマドリ		AP
Type: Transport
Builder: Mitsubishi Heavy Industries, Yokohama
Owner: Koun Steamship Co.
Call Sign: JLMM
Official Number: 44832
Laid Down:		19.02.1938
Launched:		16.05.1938
Completed as cargo ship (2,904 GRT):		10.08.1938
Service:
Civilian, Koun S/S Co.		10.08.38–1939
Civilian, Yamashita S/S Co.		1939–14.11.41
Chartered by IJN		14.11.41–01.12.41
Kure. Converted to navy auxiliary		01.12.41–10.12.41
Kure ND		01.12.41–30.06.45
Civilian, Yamashita S/S Co.		30.06.45–02.09.41
Fate: Badly damaged 23.07.45 by mine and beached. Postwar salvaged and repaired. Back into commercial service. Scrapped 1970.
Removed from Navy List:		30.06.1945
Commanding Officers:
?		?
Yamafuku Maru 山福丸クフマヤ		AP
Type: Transport
Builder: Osaka Iron Works Co., Sakurajima
Owner: Yamashita Steamship Co.
Call Sign: JJAO
Official Number: 47357
Laid Down:		?
Launched:		01.05.1940
Completed as cargo ship (4,928 GRT):		10.07.1940
Service:
Civilian, Yamashita S/S Co.		10.07.40–
Requisitioned		15.05.1941
Yokosuka ND		15.05.41–10.04.42
Kure ND		10.04.42–05.42
2nd Fleet		05.42–09.06.42
4th Fleet		09.06.42–22.08.42
Kure Naval Ditrict		22.08.42–05.01.44
Fate: Sunk 23.11.43 by USS Snook (SS-279) in the East China Sea, 20 nm NW of Hachujo Jima, Izu Islands (08°21'N, 140°08'E). 60 dead; ? saved.
Removed from Navy List:		05.01.1944
Commanding Officers:
Capt Honda Torao (M)	本田　虎雄	1941–31.07.43
Capt Ishii Otoya (M)	石井　音哉	31.07.43–28.11.43
Yamagiri Maru 山霧丸リギマヤ		AP
Type: Transport
Builder: Mitsubishi Heavy Industries Co., Yokohama
Owner: Yamashita Steamship Co.
Call Sign: JL NM
Official Number: 44612
Laid Down:		08.12.1937
Launched:		13.05.1938
Completed as passenger/cargo ship (6,438 GRT):		02.07.1938
Service:
Civilian, Yamashita S/S Co.		02.07.38–05.09.41
Requisitioned		20.09.1941
Yokohama. Converted to navy auxiliary		03.10.41–15.10.41
Sasebo ND		20.09.41–31.03.44
Fate: Sunk 17.02.44 by aircraft from US Navy TF 58 at Truk (07°23'N, 151°50'E). ? dead; ? saved.
Removed from Navy List:		31.03.1944
Commanding Officers:
Capt Sakamoto Masataka (35)	坂本正隆	20.09.41–25.05.43
Cdr Matsukawa Akira (34)	松川　晃	10.06.43–17.02.44
Yayoi Maru 弥生丸イヨヤ		AP
Type: Transport
Builder: Osaka Iron Works Co., Innoshima
Owner: Kinkai Kaisoku Steamship Co.
Call Sign: JYZH
Official Number: 40617
Laid Down:		01.03.1934
Launched:		01.05.1935
Completed as cargo ship (495 GRT):		19.06.1935
Service:
Civilian, Kinkai Kaisoku S/S Co.		19.06.35–01.04.44
Requisitioned		01.04.1944
?		01.04.44–10.11.44
Fate: Sunk 05.08.44 by USS Cobia (SS-245) off Chichijima Ialnd, Bonin Islands (27°05'N, 142°11'E).
Removed from Navy List:		10.11.1944
Commanding Officers:
?		?
Yoko Maru 陽光丸		AP
Type: Transport
Builder: Nakata Dockyard Co., Osaka
Owner: Sanko Steamship Co., Amagasaki
Call Sign: JQKM
Official Number: 44835
Laid Down:		?
Launched:		03.05.1938
Completed as cargo ship (1,050 GRT):		15.08.1938
Service:
Civilian, Sanko S/S Co.		15.08.38–01.12.42
Requisitioned		01.12.1942
Yokosuka ND		01.12.42–01.11.43
Fate: Sunk 12.09.43 by USS Harder (SS-257) WSW of Mikura Island, Izu Islands (33°49'N, 139°30'E). 8 dead; ? saved.
Removed from Navy List:		01.11.1943
Commanding Officers:
?		?
Yoshinogawa Maru 吉野川丸ワガノシヨ		AP
Type: Transport
Builder: Sanoyasu Dock Co., Osaka
Owner: Toyo Shipping Co.
Call Sign: JQRO
Official Number: 48626
Laid Down:		?
Launched:		02.12.1940
Completed as cargo ship (1,422 GRT):		29.06.1941
Service:
Requisitioned		19.04.1942
Yokosuka ND		19.04.42–14.07.42
Yokosuka. Converted to navy auxiliary		20.04.42–30.04.42
8th Fleet		14.07.42–20.04.43
Fate: Sunk 09.01.43 by USS Nautilus (SS-168) ca. 22 nm E of Bougainville, Solomons (06°10'S, 156°00'E). 8 dead; ? saved.
Removed from Navy List:		20.04.1943
Commanding Officers:
?		?