A refrigerating cycle apparatus includes: a compressor that compresses and discharges refrigerant; a radiator that makes the refrigerant discharged out of the compressor to radiate heat; a pressure reducing device that decompresses the refrigerant flowing out of the radiator; an evaporator that evaporates the refrigerant decompressed by the pressure reducing device; and a decompression control part that controls operation of the pressure reducing device. The decompression control part controls the operation of the pressure reducing device in a manner that a physical quantity which has correlation with a pressure of the refrigerant in the evaporator approaches a predetermined defrosting standard value when a time-priority defrosting mode is set.