An air-conditioning apparatus includes a first indoor unit included in a single refrigeration cycle and an outdoor unit connected to the first indoor unit via a first refrigerant pipe, and the outdoor unit is included in the single refrigeration cycle. The first indoor unit is provided with a first refrigerant leakage sensor configured to detect leakage of refrigerant flowing through the first refrigerant pipe and a concentration of leaked refrigerant, and the outdoor unit includes a compressor configured to compress the refrigerant flowing through the first refrigerant pipe, a first flow control valve configured to adjust a flow rate of the refrigerant flowing through the first refrigerant pipe, and a control unit configured to stop the compressor and fully close the first flow control valve in a case where leakage of the refrigerant flowing through the first refrigerant pipe is detected by the first refrigerant leakage sensor, and configured to change, after the compressor is stopped and the first flow control valve is fully closed, an opening speed of the first flow control valve to a speed less than an opening speed of the first flow control valve adopted before the leakage of the refrigerant is detected.