A cooling operation is carried out so that the interal temperature of a refrigerator can be kept at a set temperature. Further, when the internal temperature exceeds a predetermined deviation with respect to the set temperature, the integrated operating time of the cooling while the temperature is higher than the deviation temperature is stored with the deviation temperature. In addition, when a command signal of integrated time display is inputted, the integrated time and the deviation temperature that are stored are read out and are displayed on a segment display section (7S).
