To inexpensively acquire a synchronizing generator which allows synchronization to be instantaneously established and a synchronous condition to be held with high precision for a relatively long time.

This synchronizing generator includes at least a counter 22 with set or reset, and a synchronous detection means 24. In the synchronous detection means 24, the timing of a rising point, a falling point, or a zero crossing point of a synchronous input signal is detected. At the timing, the counter 22 is set or reset. This allows synchronization with a synchronous input signal to be instantaneously established, and when the synchronous input signal is paused or stopped, or after it is removed, the synchronous condition to be held with high precision for a relatively long time.