PURPOSE: To make it possible to measure an accurate cooking time even if the source power frequency changes by using a pulse motor timer powered by a pulse motor.

CONSTITUTION: A pulse motor timer powered by a pulse motor is used. Because of this, even if the source power frequency changes, it will not adversely affect, allowing an accurate measurement of cooking time, and so, the parts replacement becomes unnecessary. As the pulse motor speed is made different between the reheat cooking for a short time period and the long time cooking with separate timer graduations for the respective cooking modes, the accuracy of the timer setting is not aggarvated. Because the timer setting is conducted in a simple process of the rotation of a timer knob, the ease of operation is not reduced.