To provide an engine noise reducer for a vehicle capable of sufficiently reducing the noise of an engine by effectively arranging an enclosure even in the large-sized vehicle with an engine body mounted on a chassis at the rear of a cabin.

In the large-sized vehicle with the engine body 3 mounted on the chassis 2 at the rear of the cabin 1 and encircled by the air permeable enclosure 5, a suction port 7 of the enclosure 5 is opened on the front side of the vehicle in the running direction at the upper part of the cabin 1 and a discharge pot 8 is opened on the rear side of the vehicle in the running direction at the upper part of the chassis 2 and straightening plates 9 with sound absorbing materials constituting an acoustic lens are arranged in the suction port 7 and the discharge port 8.