IJN at time of Pearl Harbor Attack in December 1941:
10 (plus 3 building) (1)4 Kongō class — converted from battlecruisers. Built in 1913-1915.Kongō — †November, 1944Hiei — †November, 1942Kirishima — †November, 1942Haruna — †July, 19452 Fusō class — built 1915-1917Fusō — †October, 1944Yamashiro — †October, 19442 Ise class — built 1917-1918Ise — †July, 1945Hyūga — run aground in July, 19452 Nagato class — built 1920-1921NagatoMutsu — †June, 19430 Yamato class (3 building (1 converted to aircraft carrier Shinano) and 1 cancelled later in 1941).Yamato — commissioned 1941, † 1945Musashi — commissioned 1942, † 1944The fourth of the class, Hull Number 111 was scrapped in 1942 when only 30% complete, and a proposed fifth hull, Number 797, proposed in the 1942 5th Supplementary Program, was never ordered.6 heavy and 6 light (plus 7 building )(1)Hōshō built in 1922Akagi (2) (ex-battlecruiser converted by 1927) — †1942Kaga (ex-battleship converted in 1928) — †1942Ryūjō completed 1933 — †1942Sōryū — †1942Hiryū — †19422 Zuihō class commissioned as aircraft carriers 1940-1941Shōhō - †1942Zuihō - †19442 Shōkaku class built 1941Shōkaku — †1944Zuikaku — †19443 Taiyō classTaiyō — †1944Chūyō — †1943Unyō — †19442 Hiyō classHiyō — †1944Jun'yōShinano (ex-battleship converted in 1942-44) — †1944(1) Does not include
Imperial Japanese Army built aircraft transports.(2)
Amagi — sister ship to
Akagi both as a battlecruiser and as a conversion to an aircraft carrier, was destroyed during construction by an earthquake and replaced with the
Kaga.
18 (plus 1 building) (1)2 Furutaka built 1926-19272 Aoba built 1926-19274 Myōkō built 1928-19294 Takao built 19324 Mogami built 1935-1937(2)2 Tone built 1941(1) Ibuki ordered but not laid down (2) Mogamis designated light cruisers but were built to be up-gunned as heavies once the London Naval Treaty was broken.
20 (plus 5 building) (1)2 Tenryū built 19195 Kuma built 1920-19211 Yubari built 19233 Sendai built 1924-19256 Nagara built 1922-19253 Katori (1 cancelled) built 1938-1940(1) 4 Agano and 2 Ōyodo (1 cancelled).
126 (plus 43 building) (1)3 Momi-class destroyer (2) built 1920-192213 Minekaze-class destroyer built 1920-19227 Wakatake-class destroyer built 1922-19234 Kamikaze-class destroyer built 1922-192412 Mutsuki-class destroyer built 1925-192720 Fubuki-class destroyer built 1926-19334 Akatsuki-class destroyer built 1932-19336 Hatsuharu-class destroyer built 1933-193510 Shiratsuyu-class destroyer built 1936-193710 Asashio-class destroyer built 1937-193818 Kagerō-class destroyer built 193919 Yūgumo-class destroyer built 1941(1) 27 Yūgumo class and 16 Akatsuki class building (2) Others of class re-rated as patrol vessels (3) 2 others of class converted to patrol vessels
68 Fleet submarines50 Ko-hyoteki-class midget submarines90 patrol ships, gunboats, armed merchant ships, and submarine chasers6 minelayersItsukushima42 minesweepers55 auxiliariesMany under direct navy control as armed merchantmen.
1939 - 2,337 with 5,629,845 tonsWorld War II construction of 4,250,000 tons2,346 sunkTotal 1750 first line with 370 trainers660 Fighters330 Carrier based strike aircraft240 Land-based twin engine bombers520 Seaplanes and flying boats.Commanders
Imperial Japanese Navy commanders at the time of the Attack on Pearl Harbor:
