An air-conditioning apparatus including a refrigeration cycle in which refrigerant circulates, the refrigeration cycle including a compressor, a refrigerant flow switching device, a heat source-side heat exchanger, a load-side expansion device, and a load-side heat exchanger connected by a refrigerant pipe, the air-conditioning apparatus comprising: a first expansion device provided between the heat source-side heat exchanger and the load-side expansion device; a bypass pipe having one end connected between the first expansion device and the load-side expansion device, and allowing refrigerant flowing out of the first expansion device to flow through the bypass pipe; an auxiliary heat exchanger connected to an other end of the bypass pipe and a suction part of the compressor, and cooling refrigerant flowing through the bypass pipe and supplying the cooled refrigerant to the suction part of the compressor; and a controller configured to control the refrigerant flow switching device to switch a flow path of refrigerant between a flow path in a case where the heat source-side heat exchanger acts as a condenser or a gas cooler and a flow path in a case where the heat source-side heat exchanger acts as an evaporator, and to control an opening degree of the first expansion device, characterized in that a second expansion device is provided on a refrigerant outlet side of the auxiliary heat exchanger, and regulating a flow rate of refrigerant allowed to flow into the suction part of the compressor from the auxiliary heat exchanger; said controller is further configured to control an opening of the second expansion device, when the heat source-side heat exchanger acts as the condenser or the gas cooler, the controller being configured to control the first expansion device and the second expansion device to allow high-pressure refrigerant to flow into the auxiliary heat exchanger, and when the heat source-side heat exchanger acts as the evaporator, the controller being configured to control the first expansion device to allow medium-pressure refrigerant to flow into the auxiliary heat exchanger, and to control the second expansion device to allow refrigerant cooled in the auxiliary heat exchanger to flow into the suction part of the compressor. a first expansion device provided between the heat source-side heat exchanger and the load-side expansion device; a bypass pipe having one end connected between the first expansion device and the load-side expansion device, and allowing refrigerant flowing out of the first expansion device to flow through the bypass pipe; an auxiliary heat exchanger connected to an other end of the bypass pipe and a suction part of the compressor, and cooling refrigerant flowing through the bypass pipe and supplying the cooled refrigerant to the suction part of the compressor; and a controller configured to control the refrigerant flow switching device to switch a flow path of refrigerant between a flow path in a case where the heat source-side heat exchanger acts as a condenser or a gas cooler and a flow path in a case where the heat source-side heat exchanger acts as an evaporator, and to control an opening degree of the first expansion device, characterized in that a second expansion device is provided on a refrigerant outlet side of the auxiliary heat exchanger, and regulating a flow rate of refrigerant allowed to flow into the suction part of the compressor from the auxiliary heat exchanger; said controller is further configured to control an opening of the second expansion device, when the heat source-side heat exchanger acts as the condenser or the gas cooler, the controller being configured to control the first expansion device and the second expansion device to allow high-pressure refrigerant to flow into the auxiliary heat exchanger, and when the heat source-side heat exchanger acts as the evaporator, the controller being configured to control the first expansion device to allow medium-pressure refrigerant to flow into the auxiliary heat exchanger, and to control the second expansion device to allow refrigerant cooled in the auxiliary heat exchanger to flow into the suction part of the compressor.