An air conditioning apparatus comprising a control unit with a storage device and a computing unit and a refrigerating cycle including an electric compressor configured to compress gas refrigerant, a condenser configured to condense high-pressure gas refrigerant by exchanging heat with outside air, an expansion valve configured to convert high-temperature, high-pressure liquid refrigerant into low-temperature, low-pressure liquid refrigerant, and an evaporator configured to vaporize the low-temperature, low-pressure liquid refrigerant by exchanging heat with outside air, wherein the electric compressor is an inverter-integrated electric compressor that integrally includes a compressor, an electric motor configured to drive the compressor, and an inverter including a temperature detection unit configured to detect a temperature in the vicinity of a semiconductor switching device, the air conditioning apparatus further comprises a parameter obtaining means for obtaining the compressor power and the compressor rotational speed, and wherein the computing unit is configured to obtain following characteristics corresponding to the compressor rotational speed from the storage device: a) preset pressure loading characteristic for the compressor power, distribution of which is shown on a map of pressure at the high-pressure side versus pressure at the low-pressure side of the compressor, b) preset pressure loading characteristic for the detected temperature, distribution of which is shown on a map of pressure at the high-pressure side versus pressure at the low-pressure side of the compressor, and c) preset pressure loading characteristic for the discharge temperature of the compressor distribution of which is shown on a map of pressure at the high-pressure side versus pressure at the low-pressure side of the compressor, the computing unit is configured to draw a curve that corresponds to the temperature detected by the temperature detection unit on the obtained pressure loading characteristic for the detected temperature and draw a curve that corresponds to the compressor power obtained by the parameter obtaining means on the obtained pressure loading characteristic for the compressor power, and the computing unit is configured to draw the curve drawn on the pressure loading characteristic for the detected temperature and the curve drawn on the pressure loading characteristic for the compressor power on the pressure loading characteristic for the discharge temperature of the compressor in a superimposed manner, and the computing unit is configured to estimate the discharge temperature of the compressor by reading out the discharge temperature of the compressor at the intersection of the two curves. a) preset pressure loading characteristic for the compressor power, distribution of which is shown on a map of pressure at the high-pressure side versus pressure at the low-pressure side of the compressor, b) preset pressure loading characteristic for the detected temperature, distribution of which is shown on a map of pressure at the high-pressure side versus pressure at the low-pressure side of the compressor, and c) preset pressure loading characteristic for the discharge temperature of the compressor distribution of which is shown on a map of pressure at the high-pressure side versus pressure at the low-pressure side of the compressor,