An air conditioner comprising: an outdoor unit; a liquid-refrigerant connection pipe and a gas-refrigerant connection pipe; an indoor unit (3a, 3b, 3c, 3d) connected to the outdoor unit via the liquid-refrigerant connection pipe and the gas-refrigerant connection pipe, arranged in an air-conditioning target space, and including an indoor heat exchanger (52a, 52b, 52c, 52d) that performs heat exchange between a refrigerant, which is circulated between the indoor unit and the outdoor unit via the liquid-refrigerant connection pipe and the gas-refrigerant connection pipe, and an air, which is sent to the air-conditioning target space, an indoor expansion valve (51a, 51b, 51c, 51d) that decompresses the refrigerant, a heat-exchange-side indoor liquid-refrigerant pipe (71a, 71b, 71c, 71d) that connects a liquid side of the indoor heat exchanger to the indoor expansion valve, and a connection-side indoor liquid-refrigerant pipe (72a, 72b, 72c, 72d) that connects the indoor expansion valve to the liquid-refrigerant connection pipe; a gas-side shutoff valve (58a, 58b, 58c, 58d, 59a, 59b, 59c, 59d) that is connected to a gas side of the indoor heat exchanger; refrigerant leakage detecting means (57a, 57b, 57c, 57d) for detecting leakage of the refrigerant; and a control unit, characterized in that the indoor expansion valve is connected to the connection-side indoor liquid-refrigerant pipe by brazing, brazing portions (82a, 82b, 82c, 82d) brazing the indoor expansion valve and the connection-side indoor liquid-refrigerant pipe each are provided with a coating material (11a, 11b, 11c, 11d), and the control unit causes the indoor expansion valve and the gas-side shutoff valve to be closed in accordance with information of the refrigerant leakage detecting means when the refrigerant leaks. an outdoor unit; a liquid-refrigerant connection pipe and a gas-refrigerant connection pipe; an indoor unit (3a, 3b, 3c, 3d) connected to the outdoor unit via the liquid-refrigerant connection pipe and the gas-refrigerant connection pipe, arranged in an air-conditioning target space, and including an indoor heat exchanger (52a, 52b, 52c, 52d) that performs heat exchange between a refrigerant, which is circulated between the indoor unit and the outdoor unit via the liquid-refrigerant connection pipe and the gas-refrigerant connection pipe, and an air, which is sent to the air-conditioning target space, an indoor expansion valve (51a, 51b, 51c, 51d) that decompresses the refrigerant, a heat-exchange-side indoor liquid-refrigerant pipe (71a, 71b, 71c, 71d) that connects a liquid side of the indoor heat exchanger to the indoor expansion valve, and a connection-side indoor liquid-refrigerant pipe (72a, 72b, 72c, 72d) that connects the indoor expansion valve to the liquid-refrigerant connection pipe; a gas-side shutoff valve (58a, 58b, 58c, 58d, 59a, 59b, 59c, 59d) that is connected to a gas side of the indoor heat exchanger; refrigerant leakage detecting means (57a, 57b, 57c, 57d) for detecting leakage of the refrigerant; and a control unit, characterized in that the indoor expansion valve is connected to the connection-side indoor liquid-refrigerant pipe by brazing, brazing portions (82a, 82b, 82c, 82d) brazing the indoor expansion valve and the connection-side indoor liquid-refrigerant pipe each are provided with a coating material (11a, 11b, 11c, 11d), and the control unit causes the indoor expansion valve and the gas-side shutoff valve to be closed in accordance with information of the refrigerant leakage detecting means when the refrigerant leaks.