Abstract: A door locking device comprising a cam (3) and cam keeper (4), the cam (3) being provided with a lobe engaging (5), a fork (6) and projecting head (7), the keeper being provided with a U-shaped recess having a hook on one arm and sloped receiving surfaces (4a), (4a) and (4c) provided on the arms of cam keeper (4) engaging respectively with a sloped contacting surface (3b) on the upper surface of the lobe (5), a sloped contacting surface (3c) on the upper surface of the fork (6) and a sloped contacting surface (3d) on the lower surface of the projecting head (7) to effectively distribute loads applied to the door, to improve the durability and to make the door easy to open and close. It can be effectively applied to containers and van type vehicles.