The washing machine is provided with a heated washing process for conducting washing process by heating the washing water by controlling a heater . The washing machine is structured in a way that, during the heated washing process when the power starts supplied to the heater the power is supplied intermittently so as the power to be turned on during a first prescribed period and then turned off during a second prescribed period and such intermittent distribution of power is repeated for a specified number of times thereby prevents the temperature of the outer tank from rising abnormally when there is no water inside the outer tank and improves credibility. |