24, was an Imperial Japanese Navy Kaichū-Type submarine of the Kaichū II subclass.

The submarines of the Kaichu II sub-class were larger and had a greater range than the preceding Kaichu I subclass, but they had the same powerplant, so their greater size resulted in a loss of some speed.

For surface running, the submarines were powered by two 1,450-brake-horsepower (1,081 kW) Sulzer Mark II diesel engines, each driving one propeller shaft.

On the surface, they had a range of 6,000 nautical miles (11,000 km; 6,900 mi) at 10 knots (19 km/h; 12 mph); submerged, they had a range of 85 nmi (157 km; 98 mi) at 4 knots (7.4 km/h; 4.6 mph).

They were also armed with a single 76.2 mm (3.00 in) deck gun mounted aft of the conning tower.

[2] On 19 July 1921, a fire broke out in her galley due to faulty electrical wiring and spread to the adjacent torpedo room.

[2] She served on training duties through the end of World War II in August 1945, and was scrapped in September 1948.