A towing tractor includes a tractor body, a motor, a controller, a cable electrically connecting the motor and the controller, an axle housing integrally mounted with the motor, and a suspension through which the axle housing is supported by the tractor body. The controller is fixed to the tractor body. The length of the cable is greater than the shortest distance between the motor and the controller. The suspension allows vertical movement of the axle housing and the motor relative to the tractor body. The controller, the axle housing and the motor are arranged in this order in longitudinal direction of the tractor body. The controller is located above the axle housing and the motor. The cable led out from the motor extends below the axle housing and then upward toward the controller. The part of the cable between the axle housing and the controller forms an extra length portion.