Kaidai-type submarine

Class overview
Name	Kaidai-type submarine
Builders	Kure Naval Arsenal; Sasebo Naval Arsenal; Yokosuka Naval Arsenal; Kawasaki Shipbuilding; Mitsubishi Heavy Industries;
Operators	Imperial Japanese Navy
Subclasses	Kaidai I (I-51-class); Kaidai II (I-152-class); Kaidai IIIa (I-153-class); Kaidai IIIb (I-156-class); Kaidai IV (I-61/I-162-class); Kaidai V (I-165-class); Kaidai VIa (I-168-class); Kaidai VIb (I-174-class); Kaidai VII (I-176-class);
Built	1921–1943
In commission	1924–1945

The Kaidai-type submarine (海大型潜水艦, Kaidai-gata sensuikan) was a type of first-class submarine operated by the Imperial Japanese Navy (IJN) before and during World War II. The type name was shortened to Kaigun-shiki Ōgata Sensuikan (海軍式大型潜水艦) Navy Large Type Submarine.

All Kaidai-class submarines originally had a two-digit boat name, from I-51 onwards. On 20 May 1942, all Kaidai submarines added a '1' to their names. For example, I-52 became I-152. Ships are listed by the three-digit boat name if they had one, two-digit if they were not granted one or left service before 20 May 1942.

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