Its call sign was the Diligent Division (勤兵団, Kin Heidan).

It was formed 15 June 1944 in southern Luzon as a C(hey)-class security division.

The nucleus for the formation was the 33rd Independent Mixed Brigade and Kawashima detachment.

Prior to the Battle of Luzon, various detachments were sent north, particularly to Lamon Bay.

Although some of the detachments have fought in Cagayan during the Battle of Luzon since January 1945 and were forced to retreat to the Kiangan, Ifugao,[2] the bulk of the 105th division has survived until surrender of Japan 15 August 1945.