Junsen type submarine

Class overview
Name	Junsen type submarines
Builders	Kure Naval Arsenal Kawasaki Shipbuilding
Operators	Imperial Japanese Navy
Succeeded by	Type A submarine Type B submarine Type C submarine
Subclasses	Junsen I (I-1 class) Junsen I Modified (I-5 class) Junsen II (I-6 class) Junsen III (I-7 class)
Built	1923-1938
In commission	1926-1945

The Junsen type submarine (巡潜型潜水艦, "巡洋潜水艦", Junsen-gata sensuikan, "Cruiser submarine") was a ship class of submarines of the Imperial Japanese Navy (IJN). There were four submarine designs of the Junsen type: J1, a modified J1, J2 and the J3.