To provide a door-lock driving device 1 capable of eliminating the trouble of the operation noise of a motor 4 by restricting the driving time of the motor 4.

An electromagnetic clutch 5 is arranged between a helical gear 11 and a connecting/disconnecting device formed of a latch 8 and a ratchet 9. When an output lever 17 operates the connecting/disconnecting device from the neutral point position to the full-latch condition or the unlatch condition, the electromagnetic clutch 5 connects the helical gear 11 and an output shaft 12 to each other to transmit the turning output from the motor 4 to the output lever 17. When the operation to the full-latch condition or the unlatch condition concludes, the motor 4 is stopped. The electromagnetic clutch 5 disconnects the helical gear 11 and the output shaft 12 from each other and returns the connecting/disconnecting device to the neutral point position with the energizing force of a first output lever return spring 21 and a ratchet return spring 22 to restrict the driving time of the motor 4.