Provided is an air-conditioning apparatus that can suppress occurrence of disproportionation (an autolytic reaction) when HFO1123 refrigerant or a refrigerant mixture containing HFO1123 is applied. The air-conditioning apparatus of the present invention includes a controller 40 controlling at least one of an operation frequency of a compressor 3, an opening degree of an expansion valve 7, and an air amount of a fan sending air to a heat-source-side heat exchanger 9 so that a temperature and a pressure of the refrigerant discharged from the compressor 3 do not exceed threshold values.