An air-conditioning apparatus (100) includes: a first bypass pipe (4a) connected to an inlet-side passage of an accumulator (15) through a second expansion device (14a), a second passage of a subcooling heat exchanger (13) for exchanging heat between refrigerant flowing through the second passage of the subcooling heat exchanger (13) and refrigerant flowing through a first passage of the subcooling heat exchanger (13), and a first opening and closing device (19a); a second bypass pipe (4b) branched from the first bypass pipe (4a) between the subcooling heat exchanger (13) and the first opening and closing device (19a) and connected to an injection port of a compressor (10) through a second opening and closing device (19b); and a third bypass pipe (4c) branched from a refrigerant pipe between a heat source-side heat exchanger (12) and a use-side heat exchanger (17) and connected to the second bypass pipe (4b) between the second opening and closing device (19b) and the injection port of the compressor (10) through a third expansion device (14b).