AIR CONDITIONER

PROBLEM TO BE SOLVED: To provide an air conditioner capable of efficiently defrosting a heat exchanger as a whole while suppressing degradation of a heating capacity by reducing a bypass flow rate of a high temperature gas for defrosting in a defrosting operation of the outdoor heat exchanger.SOLUTION: In this air conditioner, a refrigeration cycle is constituted by connecting a compressor 1, a four-way valve 2, an indoor heat exchanger, an outdoor expansion valve 4 and the outdoor heat exchanger 3 by refrigerant piping. The outdoor heat exchanger includes a plurality of pathways, so that the liquid refrigerant from the indoor heat exchanger is branched to a plurality of branch pipes after passing through the outdoor expansion valve, to flow in each of the plurality of pathways of the outdoor heat exchanger. A bypass circuit 17 is disposed for branching a part of a refrigerant of high temperature and high pressure discharged from the compressor and allowing the same to flow to an inlet side in a heating operation of the outdoor heat exchanger, the bypass circuit includes a bypass solenoid valve 6, a side connected to the outdoor heat exchanger is composed of a plurality of distribution pipes 10 having capillary tubes 19, and the plurality of distribution pipes are respectively connected to the pathways of the outdoor heat exchanger.