Providing an air-conditioning apparatus that is capable of securing safety while reducing load to the environment. The air-conditioning apparatus 100 includes a concentration detection device 305 that detects the concentration of a heat source side refrigerant leaking from the refrigerant circuit, shut off devices (first shut off device 303 and second shut off device 304) that shut off the circulation of the heat source side refrigerant on the basis of information from the concentration detection device 305.
