A refrigeration apparatus, comprising: a compression mechanism (2, 102, 202, 302) having a plurality of compression elements and configured so that refrigerant discharged from a first-stage compression element of the plurality of compression elements is sequentially compressed by a second-stage compression element; a heat source-side heat exchanger which functions as a radiator or evaporator of refrigerant; a usage-side heat exchanger which functions as an evaporator or radiator of refrigerant; a switching mechanism for switching between a cooling operation state wherein refrigerant is sequentially circulated through the compression mechanism, the heat source-side heat exchanger functioning as a refrigerant radiator, and the usage-side heat exchanger functioning as an evaporator of refrigerant; and a heating operation state wherein refrigerant is sequentially circulated through the compression mechanism, the usage-side heat exchanger functioning as a refrigerant radiator, and the heat source-side heat exchanger functioning as an evaporator of refrigerant; and an intermediate heat exchanger (7, 307) capable of functioning as a cooler of refrigerant discharged from the first-stage compression element and drawn into the second-stage compression element when the switching mechanism has been set to the cooling operation state, and also capable of functioning as an evaporator of refrigerant whose heat is radiated in the usage-side heat exchanger when the switching mechanism has been set to the heating operation state, wherein the intermediate heat exchanger (7, 307) is provided with an intermediate refrigerant tube (8, 308) for drawing the refrigerant discharged from the first-stage compression element into the second-stage compression element; an intermediate heat exchanger bypass tube (9, 309) is connected to the intermediate refrigerant tube so as to bypass the intermediate heat exchanger; and the refrigeration apparatus further comprises an intake return tube (92, 392) for connecting one end of the intermediate heat exchanger with an intake side of the compression mechanism (2, 102, 202, 302), and an intermediate heat exchanger return tube (94, 394) for connecting the other end of the intermediate heat exchanger with the portion between the usage-side heat exchanger and the heat source-side heat exchanger. a compression mechanism (2, 102, 202, 302) having a plurality of compression elements and configured so that refrigerant discharged from a first-stage compression element of the plurality of compression elements is sequentially compressed by a second-stage compression element; a heat source-side heat exchanger which functions as a radiator or evaporator of refrigerant; a usage-side heat exchanger which functions as an evaporator or radiator of refrigerant; a switching mechanism for switching between a cooling operation state wherein refrigerant is sequentially circulated through the compression mechanism, the heat source-side heat exchanger functioning as a refrigerant radiator, and the usage-side heat exchanger functioning as an evaporator of refrigerant; and a heating operation state wherein refrigerant is sequentially circulated through the compression mechanism, the usage-side heat exchanger functioning as a refrigerant radiator, and the heat source-side heat exchanger functioning as an evaporator of refrigerant; and an intermediate heat exchanger (7, 307) capable of functioning as a cooler of refrigerant discharged from the first-stage compression element and drawn into the second-stage compression element when the switching mechanism has been set to the cooling operation state, and also capable of functioning as an evaporator of refrigerant whose heat is radiated in the usage-side heat exchanger when the switching mechanism has been set to the heating operation state, wherein the intermediate heat exchanger (7, 307) is provided with an intermediate refrigerant tube (8, 308) for drawing the refrigerant discharged from the first-stage compression element into the second-stage compression element; an intermediate heat exchanger bypass tube (9, 309) is connected to the intermediate refrigerant tube so as to bypass the intermediate heat exchanger; and the refrigeration apparatus further comprises an intake return tube (92, 392) for connecting one end of the intermediate heat exchanger with an intake side of the compression mechanism (2, 102, 202, 302), and an intermediate heat exchanger return tube (94, 394) for connecting the other end of the intermediate heat exchanger with the portion between the usage-side heat exchanger and the heat source-side heat exchanger.