The reference book offered to the attention of readers contains information about the tactical and technical elements and careers of submarines that were part of active formations, under construction or included in the shipbuilding programs of the Imperial Japanese Navy in the period from October 1918 to August 1945. Shown schematically longitudinal section of submarines, their appearance in two projections during different periods of service. The reference book is intended for historians, students and cadets of naval institutions, as well as for all those who are interested in the history of the war at sea.