PURPOSE: To reduce deformation of a cab when large shock load is applied to a cab of a cab-over-engine truck.

CONSTITUTION: A stopper 20 including a first plate 21 which is fixed to an engine with an upper plate fixed to the engine of an engine rear mount, and disposed in the rear of the engine in such a manner as to face a frame 1, a second plate 23 which is disposed and fixed facing the first plate 21 in the rear of the engine of the frame, and a thrust rod for connecting the first and second plates to each other is interposed between an engine rear mount 9 of a cab-over-engine truck where a cab is disposed above an engine 7 mounted on the front end of the frame 1 and the frame 1.