An all-wheel-drive vehicle in which flexibility in setting the diameter of a driven gear is increased. In an all-wheel-drive vehicle in which an engine drives a rear wheel and also drives a hydraulic pump, and oil pressure generated by the hydraulic pump is supplied to a hydraulic motor for driving a front wheel. A front wheel hub provided on the front wheel is formed into a cup-shaped hub provided with a recess portion covered by a cover. The hydraulic motor is supported by the cover. A drive gear is provided on an output shaft of the hydraulic motor and a driven gear is provided in the recess portion of the hub with the driven gear being provided on the side of an axle.