In a legged mobile robot having an electric motor installed at a location between a foot and each leg to drive the ankle joint, a force sensor installed at the location between the foot and each leg to detect a floor reaction force acting from a floor surface on which the foot lands, and a cushioning member attached to the foot sole to cushioning impact that occurs when the foot lands on the floor surface, conductive members are disposed in depressions formed at the cushioning member, such that the conductive members contact the floor surface when the cushioning member contracts, thereby discharging and removing static electric charge electrified on the foot.