Patent ID: 8117937

Claim:
An automobile door-lock drive device housing a worm gear provided on an output shaft of an electric motor and a wheel gear engaging with the worm gear in a case and performing a switching operation of a lock mechanism using a torque of the wheel gear, comprising: a support member provided in the case and making contact with the worm gear and the electric motor while interposed therebetween, and a transmission section comprising the output shaft of the electric motor and the worm gear pivotally supported on the output shaft, the transmission section being configured so as to allow relative motion of the output shaft and the worm gear along a thrust direction of the worm gear, the support member being configured to contact the worm gear to receive a force along the thrust direction due to dynamic inertia of the wheel gear, when the motor is stopped, wherein the support member includes a bottomed recess, and an end section of the worm gear on the electric-motor side is rotatably received in the bottomed recess.