Nanyo Kaiun K.K. (1937-1938) Ono Shoji Gomei K.K. (1938-1943)

Taiyo Kogyo, K. K (1943-1944) Ordered1913 BuilderMitsubishi Dockyard & Engineering Works Laid down4 August 1913 Launched20 March 1915 Completed3 June 1915 In serviceJune 1915 Out of serviceJune 29th 1944 FateSunk by USS Sturgeon near Tairajima, 29 June 1944 Notes6th deadliest Maritime disaster General characteristics TypeTroop transport Tonnage7,085 GRT Length135.6 metres (445 ft) Beam17.7 metres (58 ft) Draught10.4 metres (34 ft) Installed power5700 shp Propulsion4 x Steam turbine engines DR geared to dual shaft, 2 screws, 4 single boilers, 12 corrugated furnaces Speed14.5 knots (26.9 km/h; 16.7 mph) Complement4330 Crew76

Toyama Maru (富山丸) was a 7,089-ton Japanese troop transport during World War II. On 29 June 1944, Toyama Maru was transporting over 6,000 men of the Japanese 44th Independent Mixed Brigade when she was torpedoed and sunk.

Toyama Maru was laid down on 4 August 1913, at Mitsubishi Dockyard & Engineering Works as Yard No. 243. In Nagasaki, and was launched on 20 March 1915, and completed 3 months later. Toyama Maru had a length of 445 ft (135 m) a beam of 58 ft (17 m). With a tonnage of 7,085 GRT, she had a speed of about 14 knots (26 km/h; 16 mph).

After Toyama Maru was completed she began her maiden voyage, under the NYK Line. During the First World War she served European routes, transportation food and Ammunition. She survived World War I, and for the next 14 years she had an uneventful career. In 1933 she was switched to the Kobe to Surabaya route, in 1937, she was sold to the Company Nanyo Kaiun K.K. She served with the Company until 1938, when she was sold to the Company Ono Shoji Gomei K.K. She had an uneventful life until September 1941.

In September 1941 she was requisitioned by the Imperial Japanese Army to serve in the Second World War. She would be used as a Troop transport and transported troops. In 1943 As the result of a merger, Toyama Maru is transferred to Taiyo Kogyo, K. K. She would continue to serve as a Troop transport until June 1944.

On 27 June 1944, Toyama Maru departed Kagoshima Bay bound for Naha City on what would become her final voyage, with over 6,000 people aboard. She departed with 11 other ships forming the Kata 412 convoy. At 07:30, the American submarine USS Sturgeon (SS-187), stalking the convoy, spotted and fired four torpedoes at Toyama Maru. Two of the torpedoes hit the bow, igniting hundreds of gasoline drums, engulfing the ship in flames. A third torpedo hit mid-ship, breaking the ship in half, and she promptly sank in the Nansei Shoto, off Taira Jima, Japan, at approximate position 27º47'N, 129º05'E. 5,400 soldiers and crew members were killed during the sinking, with 600 surviving.

• List by death toll of ships sunk by submarines

• Yahara, Hiromichi (1997). The Battle for Okinawa. Wiley. ISBN 0-471-18080-7.

* Duncan, George. "1944: Maritime Disasters of World War II". Historical Facts of World War II.

27°47′N 129°05′E / 27.783°N 129.083°E / 27.783; 129.083