To provide satisfactory reliability of a compressor by storing part of a refrigerant charged in anticipation of an operation of all of indoor units, in part of a refrigerant circuit, and returning the refrigerant to the compressor according to changing situations.

In the air conditioner including the compressor 21, a four-way valve 22, an outdoor heat exchanger 23, a pressure reducer 24, and an indoor heat exchanger 47, an accumulator 25 for storing a gas-liquid mixture of the refrigerant including oil after heat exchange, is disposed between the four-way valve 22 and the compressor 21, a plurality of return adjustment pipes 36a, 36b, ... respectively set in different heights of returned liquid, are disposed in the accumulator 25, the return adjustment pipes 36a, 36b, ... are connected with the return pipe 35 through solenoid valves 37a, 37b, ... respectively selectively opened and closed according to driving situation, and the return pipe 35 is connected between the accumulator 25 and the compressor 21.