An insert member is placed on one end surface of an armature on one axial side. A rotatable shaft member is integrally molded into one piece from a resin material and includes a shaft portion, a flange portion and a boss portion. The shaft portion axially extends through the armature and the insert member. The flange portion supports the other end surface of the armature on the other axial side. The armature and the insert member are fitted to the boss portion. The urging member is axially placed between a bottom portion of a motor housing and the insert member and axially urges the armature against the flange portion.