To obtain a refrigeration device for controlling a discharge pressure of a compressor, and for controlling decrease in an efficiency of operation, by controlling a heat exchange amount of an intake heat exchanger, even when performing an intermediate pressure injection.

The refrigeration device 50 includes at least a compressor 1, radiator 2, internal heat exchanger 6, middle expansion valve 3c, intake heat exchanger 5, main expansion valve 3a, evaporator 4, intake heat exchanger 5, and main circuit 31, which are annularly connected by the refrigerant piping again in the order of the compressor 1.