In a vehicle exhaust device, rear wheels are disposed outside of rear side members extending in a vehicle front-rear direction. Opening portions are formed at side portions, in the vehicle width-direction, of a rear bumper. Diffusers extending into the rear bumper are mounted in the opening portions. Mufflers are disposed at a rear portion of the vehicle with axes of the mufflers extending in the vehicle front-rear direction, and tail pipes connected to rear end faces of the mufflers are inserted into the diffusers while spaced from inner peripheries of the diffusers. The mufflers are disposed on rear sides of the rear wheels in the vehicle front-rear direction with outer peripheral faces of the mufflers protruding outside the rear side members in the vehicle-width direction, and with the rear end faces of the mufflers facing front end opening portions of the diffusers.