To provide an oxygen concentrator that can ensure safety by interrupting oxygen in a case where the oxygen concentrator is exposed to fire or an abnormal high-temperature environment when a user thereof is inhaling oxygen with a cannula.The oxygen concentrator includes: a compressor 10 separating compressed air by compressing raw air an oxygen outlet 100 for discharging oxygen acquired from the compressed air a coupler 17 mounted on a tube 72 of a cannula 70 and removably connecting the tube 72 to the oxygen outlet 100, and moreover having a temperature sensor 400 and a control unit 200 stopping operation of the compressor 10 to interrupt the supply of oxygen when a temperature sensed by the temperature sensor 400 reaches a predetermined temperature or higher.
