A hydraulic-drive work vehicle includes a plurality of variable capacity hydraulic motors which are rotated by receiving pressure oil from a variable capacity hydraulic pump. Wheels provided at two or more axles are rotated due to torques of the hydraulic motors. The work vehicle is provided with a traveling stabilizer, the traveling stabilizer including a traveling-state detector for detecting a traveling state of the vehicle, and a controller which receives a signal from the detector and varies a capacity of at least particular one of the plurality of hydraulic motors according to the traveling state of the vehicle.