An air-conditioning apparatus, comprising: at least one indoor unit (310a, 310b) including an indoor heat exchanger (312a, 312b), and an indoor-side expansion device (311a, 311b); a plurality of heat source units (110a, 110b) connected in parallel to the at least one indoor unit (310a, 310b), each of the plurality of heat source units (110a, 110b) including a compressor (111a, 111b), an outdoor heat exchanger (113a, 113b) configured to function at least as an evaporator, an accumulator (115a, 115b) connected to a suction side of the compressor (111a, 111b), and a flow control device (125a, 125b, 126a, 126b, 128a, 128b) configured to regulate a flow rate of the refrigerant flowing through the outdoor heat exchanger (113a, 113b); and a controller configured to control at least one of the heat exchange target supply unit (127a, 127b) and the flow control device (125a, 125b, 126a, 126b, 128a, 128b), characterized in that the air-conditioning apparatus further comprises at least one of a heat exchange target supply unit (127a, 127b) configured to supply a heat exchange target for refrigerant to the outdoor heat exchanger (113a, 113b), wherein two of the plurality of heat source units (110a, 110b) include one unit corresponding to an upper heat source unit installed on an upper side and an other unit corresponding to a lower heat source unit installed below the upper heat source unit, and wherein the controller is configured to, under a state in which the outdoor heat exchanger (113a, 113b) functions as an evaporator, control at least one of the heat exchange target supply unit (127a, 127b) and the flow control device (125a, 125b, 126a, 126b, 128a, 128b) so that the amounts of liquid returned to the accumulator (115a, 115b) of the upper heat source unit and the lower heat source unit become the same. at least one indoor unit (310a, 310b) including an indoor heat exchanger (312a, 312b), and an indoor-side expansion device (311a, 311b); a plurality of heat source units (110a, 110b) connected in parallel to the at least one indoor unit (310a, 310b), each of the plurality of heat source units (110a, 110b) including a compressor (111a, 111b), an outdoor heat exchanger (113a, 113b) configured to function at least as an evaporator, an accumulator (115a, 115b) connected to a suction side of the compressor (111a, 111b), and a flow control device (125a, 125b, 126a, 126b, 128a, 128b) configured to regulate a flow rate of the refrigerant flowing through the outdoor heat exchanger (113a, 113b); and a controller configured to control at least one of the heat exchange target supply unit (127a, 127b) and the flow control device (125a, 125b, 126a, 126b, 128a, 128b), characterized in that the air-conditioning apparatus further comprises at least one of a heat exchange target supply unit (127a, 127b) configured to supply a heat exchange target for refrigerant to the outdoor heat exchanger (113a, 113b), wherein two of the plurality of heat source units (110a, 110b) include one unit corresponding to an upper heat source unit installed on an upper side and an other unit corresponding to a lower heat source unit installed below the upper heat source unit, and wherein the controller is configured to, under a state in which the outdoor heat exchanger (113a, 113b) functions as an evaporator, control at least one of the heat exchange target supply unit (127a, 127b) and the flow control device (125a, 125b, 126a, 126b, 128a, 128b) so that the amounts of liquid returned to the accumulator (115a, 115b) of the upper heat source unit and the lower heat source unit become the same.