A rear body structure of a vehicle including a rear combination lamp whose lateral ends extend on side surfaces of the rear body structure, comprises rear fenders which are depressed forwardly with a depth corresponding to a distance that the lateral ends of the rear combination lamp extend on the side surfaces of the body structure, and a rear end panel being flush with a depressed surfaces of the rear fenders to form a mounting surface for the rear combination lamp, thereby making easy the mounting and sealing of the rear combination lamp whose lateral ends emanate light beams sideways.