PURPOSE: To make it possible to certainly perform first hand movement after a power source is turned ON, by controlling the output direction of a motor driving force on the basis of the detection of rotation and non-rotation.

CONSTITUTION: The output of an oscillator circuit 1 is supplied to a pulse synthesizer circuit 3 while subjected to frequency division by a frequency divider circuit 2 and synthesized as the operation pulse of a motor driver 4 and a detection circuit 5. The driver 4 operates a motor 6 and the detection circuit 5 amplifies the inverse electromotive force of a coil generated at the output terminal of the driver 4 when the motor 6 is driven to discriminate the rotation and non- rotation of the motor 6. The output direction of a motor driving force is changed over and controlled on the basis of said discriminated output. As a result, the motor 6 can be certainly operated in first hand movement after a power source switch 1 to actuate in conjunction with a crown is turned ON.