To provide a refrigeration apparatus capable of stably obtaining a high COP by suppressing an influence of an ambient temperature irrespective of a refrigeration cycle using carbon dioxide as coolant.

The refrigeration apparatus 10 includes a first refrigeration cycle 12 which comprises a first compressor 18, a first heat radiator 20, a second compressor 22, a second heat radiator 24 connected with the discharge side of the second compressor 22, a heat exchanger 16 connected with the outlet side of the second heat radiator 24, an expansion device 26 connected with the outlet side of the heat exchanger 16 and a heat sink 28, and uses carbon dioxide as coolant, and a second refrigeration cycle 14 which comprises a compressor 36, a heat radiator 38 and an expansion device 40, and connects a heat exchanger 16 between the outlet side of the expansion device 40 and the compressor 36, wherein the heat exchanger 16 is configured so as to make the coolant of the first refrigeration cycle 12 and the coolant of the second refrigeration cycle 14 heat-exchangeable to each other.