An air-conditioning apparatus comprising: a circuit formed by connecting, by a pipe, a compressor that compresses refrigerant, a flow switching device, a heat source-side heat exchanger, an expansion unit (14a, 14b), a load-side heat exchanger (15a, 15b), and an accumulator; a bypass pipe that connects a position between the heat source-side heat exchanger and the expansion unit (14a, 14b), with an upstream side of the accumulator; a bypass opening and closing device provided to the bypass pipe to control a flow rate of refrigerant flowing in the bypass pipe; a leakage detection unit that detects refrigerant leakage; and a control unit configured to switch the flow switching device to switch between a cooling operation and a heating operation, the cooling operation being an operation in which the heat source-side heat exchanger acts as a condenser, the heating operation being an operation in which the heat source-side heat exchanger acts as an evaporator, wherein the control unit includes a first controller configured to, in response to detection of refrigerant leakage by the leakage detection unit, switch the flow switching device to connect a discharge side of the compressor with the heat source-side heat exchanger, close the expansion unit (14a, 14b), and open the bypass opening and closing device, and a second controller configured to, after operation of the first controller ends, switch the flow switching device to connect the discharge side of the compressor with the load-side heat exchanger (15a, 15b), and stop the compressor. a circuit formed by connecting, by a pipe, a compressor that compresses refrigerant, a flow switching device, a heat source-side heat exchanger, an expansion unit (14a, 14b), a load-side heat exchanger (15a, 15b), and an accumulator; a bypass pipe that connects a position between the heat source-side heat exchanger and the expansion unit (14a, 14b), with an upstream side of the accumulator; a bypass opening and closing device provided to the bypass pipe to control a flow rate of refrigerant flowing in the bypass pipe; a leakage detection unit that detects refrigerant leakage; and a control unit configured to switch the flow switching device to switch between a cooling operation and a heating operation, the cooling operation being an operation in which the heat source-side heat exchanger acts as a condenser, the heating operation being an operation in which the heat source-side heat exchanger acts as an evaporator, wherein the control unit includes a first controller configured to, in response to detection of refrigerant leakage by the leakage detection unit, switch the flow switching device to connect a discharge side of the compressor with the heat source-side heat exchanger, close the expansion unit (14a, 14b), and open the bypass opening and closing device, and a second controller configured to, after operation of the first controller ends, switch the flow switching device to connect the discharge side of the compressor with the load-side heat exchanger (15a, 15b), and stop the compressor. a first controller configured to, in response to detection of refrigerant leakage by the leakage detection unit, switch the flow switching device to connect a discharge side of the compressor with the heat source-side heat exchanger, close the expansion unit (14a, 14b), and open the bypass opening and closing device, and a second controller configured to, after operation of the first controller ends, switch the flow switching device to connect the discharge side of the compressor with the load-side heat exchanger (15a, 15b), and stop the compressor.