An assembling operation of a wiper motor is facilitated. An output shaft and a gear shaft of the sector gear part are connected by a swinging plate. A first slidable contact member is mounted on a tip of the output shaft, and a second slidable contact part is mounted on a tip of the gear shaft. Since these slidably contact with a cover, axial-directional movement of the respective shafts is restricted. In addition, a provisional holding part having a leg part extending in an axial direction and a claw part protruding from the leg part is formed integrally with the second slidable contact part, and the sector gear part and the swinging part are sandwiched between the claw part and the second slidable contact part, whereby the motive power conversion member and the swinging plate are provisionally held.