PURPOSE: To enable sure release of ice being made, without cracking it, by a method wherein a heater provided at the bottom of an ice making tray is made to generate a heat when ice making is completed, and after the interface of the ice and the ice making tray is melted, the ice making tray is rotated to release the ice.

CONSTITUTION: When water is put in a supply water tank 11 and setting is made, a proper quantity of water is supplied from the supply water tank 11 to an ice making tray 16 through a supply water hose 12 and ice making is started. When a sensor 5 detects that the temperature of completion of the ice making is reached, a heater 18 is electrified to generate a heat. When the sensor 5 detects a rise to a prescribed temperature, the electrification of the heater 18 is canceled, the ice making tray 16 is rotated at an angle of 360° by a driving device 19 and ice is released. Thereby the ice can be released without giving a twist to the ice making tray 16.