To obtain a fully automatic dishwasher of a low cost without using a humidity sensor by presuming a drying finished state of dishes in the dishwasher according to a detecting temperature by an exhaust temperature sensor.

When dishes to be dried are introduced into the dishwasher 1 and a power source switch is turned on, a blower 4 is driven, and the atmosphere is sucked from a suction port 2. The suction atmospheric temperature is detected by a temperature sensor 3. The exhaust air from the blower 4 is heated by a heater 5, passes as warm air through an interior of the dishwasher 1, and externally exhausted from an exhaust port 8. The exhaust air temperature is detected by an exhaust air temperature sensor 7, and drying finished state of the dishes in the dishwater is presumed according to the detected temperature of the sensor 7. The entirety is controlled by a control board 9. Thus, a fully automatic dishwasher of power dissipation alleviation type to be easily handled of a low cost is obtained.