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, 1944
Hiei — †November, 1942
Kirishima — †November, 1942
Haruna — †July, 1945
2 Fusō class — built 1915-1917
Fusō — †October, 1944
Yamashiro — †October, 1944
2 Ise class — built 1917-1918
Ise — †July, 1945
Hyūga — run aground in July, 1945
2 Nagato class — built 1920-1921
Nagato
Mutsu — †June, 1943
0 Yamato class (3 building (1 converted to aircraft carrier Shinano) and 1 cancelled later in 1941).
Yamato — commissioned 1941, † 1945
Musashi — commissioned 1942, † 1944
The 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 1922
Akagi (2) (ex-battlecruiser converted by 1927) — †1942
Kaga (ex-battleship converted in 1928) — †1942
Ryūjō completed 1933 — †1942
Sōryū — †1942
Hiryū — †1942
2 Zuihō class commissioned as aircraft carriers 1940-1941
Shōhō - †1942
Zuihō - †1944
2 Shōkaku class built 1941
Shōkaku — †1944
Zuikaku — †1944
3 Taiyō class
Taiyō — †1944
Chūyō — †1943
Unyō — †1944
2 Hiyō class
Hiyō — †1944
Jun'yō
Shinano (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 1926-1927
2 Aoba built 1926-1927
4 Myōkō built 1928-1929
4 Takao built 1932
4 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 1919
5 Kuma built 1920-1921
1 Yubari built 1923
3 Sendai built 1924-1925
6 Nagara built 1922-1925
3 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 1920-1922
13 Minekaze-class destroyer built 1920-1922
7 Wakatake-class destroyer built 1922-1923
4 Kamikaze-class destroyer built 1922-1924
12 Mutsuki-class destroyer built 1925-1927
20 Fubuki-class destroyer built 1926-1933
4 Akatsuki-class destroyer built 1932-1933
6 Hatsuharu-class destroyer built 1933-1935
10 Shiratsuyu-class destroyer built 1936-1937
10 Asashio-class destroyer built 1937-1938
18 Kagerō-class destroyer built 1939
19 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 submarines
50 Ko-hyoteki-class midget submarines
90 patrol ships, gunboats, armed merchant ships, and submarine chasers
6 minelayers
Itsukushima
42 minesweepers
55 auxiliaries
Many under direct navy control as armed merchantmen.
1939 - 2,337 with 5,629,845 tons
World War II construction of 4,250,000 tons
2,346 sunk
Total 1750 first line with 370 trainers
660 Fighters
330 Carrier based strike aircraft
240 Land-based twin engine bombers
520 Seaplanes and flying boats.
Commanders
Imperial Japanese Navy commanders at the time of the Attack on Pearl Harbor:
