PURPOSE: To obtain an air-conditioning machine, in which the development of trouble of a compressor due to the failure of lubrication is prevented.

CONSTITUTION: In a refrigerating cycle 21 capable of effecting cooling and heating, a compressor 22 is provided with an oil temperature sensor 27, detecting an internal oil temperature To, and an indoor heat exchanger 24 is provided with a condensing temperature sensor 28, detecting the condensing temperature Tc of refrigerant, and a control device 30, controlling the opening degree of an expansion valve 26 and storing the condensing temperature Tc, while the opening degree of the expansion valve 26 is controlled so that the internal oil temperature To becomes higher than the condensing temperature Tc1 upon starting defrosting. According to this method, the opening degree of the expansion valve 26 is controlled and the internal oil temperature will never be reduced to a temperature lower than the condensing temperature Tc1 even when liquid is sent back by the defrosting operation and the internal oil temperature To is lowered whereby the internal oil temperature To becomes higher than the condensing temperature Tc even when heating operation is restarted and the condensing temperature Tc is increased and, therefore, the lubricating performance of oil in the compressor 22 can be secured and the compressor will never cause trouble.