PURPOSE: To improve A heating efficiency and perform defrosting operation within a short period of time without reducing heating capability by a method wherein heat generated at a partition wall or the like generated by an electromagnetic induction heating when a motor part is operated is utilized.

CONSTITUTION: A compressor 1 is constructed such that a compressing part 3 for forcedly feeding refrigerant and a motor part 2 having a magnet rotor for use in driving this compression part 3 are integrally formed with a metallic partition wall 13. At the partition wall 13 a heat accumulation device 26 capable of feeding out the refrigerant from an indoor side heat exchanger to an outdoor side heat exchanger is fixed to an outer circumferential wall of an upper partition wall 13a. Heat generated at the upper partition wall 13a generated under an electromagnetic induction heating is accumulated in advance in a heat accumulating material 11, the refrigerant is heated by heat accumulated at the time of defrosting of the outdoor side heat exchanger and a temperature of the refrigerant flowing into the outdoor side heat exchanger is increased.