An air-conditioning apparatus comprising: a heat-source-unit-side heat exchanger; a plurality of use-side heat exchangers (105, 105c, 105d); a plurality of first flow rate control units (109, 109c, 109d) for controlling flow rate in the use-side heat exchangers (105, 105c, 105d); wherein the air-conditioning apparatus performs a cooling and heating simultaneous operation by switching each of the plurality of use-side heat exchangers (105, 105c, 105d) to the cooling operation side or the heating operation side in accordance with a control instruction; a relay unit provided between the heat-source-unit-side heat exchanger and the plurality of use-side heat exchangers (105, 105c, 105d), configured to switch part of the plurality of use-side heat exchangers (105, 105c, 105d) to a cooling operation side, and switch part of the plurality of use-side heat exchangers (105, 105c, 105d) to a heating operation side, characterized in that the relay unit includes a second flow rate control unit configured to adjust a flow rate of a refrigerant to be distributed to the heat-source-unit-side heat exchanger and a use-side heat exchanger (105, 105c, 105d) that is performing the cooling operation among the plurality of use-side heat exchangers (105, 105c, 105d), a temperature detection device configured to measure a downstream-side temperature on a downstream side of the second flow rate control unit, a liquid pipe temperature detection device configured to measure a liquid pipe temperature of the use side heat exchanger (105, 105c, 105d) that is performing the cooling operation, a controller configured to adjust the second flow rate control unit, and wherein the controller obtains, based on the downstream-side temperature of the second flow rate control unit and the liquid pipe temperature, a target control temperature of the downstream-side temperature, and controls the liquid pipe temperature by adjusting the second flow rate control unit in accordance with the target control temperature. a heat-source-unit-side heat exchanger; a plurality of use-side heat exchangers (105, 105c, 105d); a plurality of first flow rate control units (109, 109c, 109d) for controlling flow rate in the use-side heat exchangers (105, 105c, 105d); wherein the air-conditioning apparatus performs a cooling and heating simultaneous operation by switching each of the plurality of use-side heat exchangers (105, 105c, 105d) to the cooling operation side or the heating operation side in accordance with a control instruction; a relay unit provided between the heat-source-unit-side heat exchanger and the plurality of use-side heat exchangers (105, 105c, 105d), configured to switch part of the plurality of use-side heat exchangers (105, 105c, 105d) to a cooling operation side, and switch part of the plurality of use-side heat exchangers (105, 105c, 105d) to a heating operation side, characterized in that the relay unit includes a second flow rate control unit configured to adjust a flow rate of a refrigerant to be distributed to the heat-source-unit-side heat exchanger and a use-side heat exchanger (105, 105c, 105d) that is performing the cooling operation among the plurality of use-side heat exchangers (105, 105c, 105d), a temperature detection device configured to measure a downstream-side temperature on a downstream side of the second flow rate control unit, a liquid pipe temperature detection device configured to measure a liquid pipe temperature of the use side heat exchanger (105, 105c, 105d) that is performing the cooling operation, a controller configured to adjust the second flow rate control unit, and a second flow rate control unit configured to adjust a flow rate of a refrigerant to be distributed to the heat-source-unit-side heat exchanger and a use-side heat exchanger (105, 105c, 105d) that is performing the cooling operation among the plurality of use-side heat exchangers (105, 105c, 105d), a temperature detection device configured to measure a downstream-side temperature on a downstream side of the second flow rate control unit, a liquid pipe temperature detection device configured to measure a liquid pipe temperature of the use side heat exchanger (105, 105c, 105d) that is performing the cooling operation, a controller configured to adjust the second flow rate control unit, and wherein the controller obtains, based on the downstream-side temperature of the second flow rate control unit and the liquid pipe temperature, a target control temperature of the downstream-side temperature, and controls the liquid pipe temperature by adjusting the second flow rate control unit in accordance with the target control temperature. obtains, based on the downstream-side temperature of the second flow rate control unit and the liquid pipe temperature, a target control temperature of the downstream-side temperature, and controls the liquid pipe temperature by adjusting the second flow rate control unit in accordance with the target control temperature.