PURPOSE: To provide a defreezing method for a frozen food in which a degree of freshness of the food can be kept high and a rapid defreezing can be carried out.

CONSTITUTION: A refrigeration temperature of a food including a minus temperature range is set as an inter-refrigerator set temperature, an upper limit temperature and a lower limit temperature are set across the set temperature, and at the same time a frozen food is stored within the refrigerator and when the temperature within the refrigerator is decreased down to the lower limit temperature due to a cooling action obtained from the frozen food, a heating heater 42 is operated and when the temperature within the refrigerator is increased up to the upper limit temperature under an operation of this heating heater 42, the heating heater 42 is stopped in its operation.