A refrigeration apparatus in which a refrigerant flows sequentially through a compressor, an outdoor heat exchanger, expansion mechanisms (24, 26), and an indoor heat exchanger during a cooling operation, and the refrigerant flows sequentially through the compressor, the indoor heat exchanger, the expansion mechanisms (24, 26), and the outdoor heat exchanger during a heating operation; wherein a capacity of the outdoor heat exchanger, which is the liquid refrigerant quantity that can be accommodated in the outdoor heat exchanger, is less than a capacity of the indoor heat exchanger, which is the liquid refrigerant quantity that can be accommodated in the indoor heat exchanger; the expansion mechanisms (24, 26) include an upstream-side expansion mechanism for depressurizing the refrigerant that has radiated heat in the outdoor heat exchanger to an intermediate pressure in the refrigeration cycle, and a downstream-side expansion mechanism for depressurizing the refrigerant that has been depressurized in the upstream-side expansion mechanism and temporarily stored in a refrigerant storage tank to a low pressure in the refrigeration cycle; and wherein the refrigerant storage tank is provided between the upstream-side expansion mechanism and the downstream-side expansion mechanism; wherein the refrigeration apparatus further comprising a control part for performing an operation control, wherein the refrigeration apparatus is configured to control the cooling operation by means of the control part, wherein the refrigerant depressurized by the upstream-side expansion mechanism to the intermediate pressure in the refrigerant cycle is stored in the refrigerant storage tank and an excess refrigerant produced during the cooling operation due to the capacity of the outdoor heat exchanger being less than the capacity of the indoor heat exchanger is accommodated in the refrigerant storage tank, the refrigeration apparatus further comprising an outdoor unit, an indoor unit and liquid refrigerant communication tube, wherein the outdoor heat exchanger, upstream-side expansion mechanism and the downstream-side expansion mechanism are provided in the outdoor unit, and the indoor heat exchanger is provided in the indoor unit, and the indoor unit and the outdoor unit are connected via the liquid refrigerant communication tube; wherein the refrigerant is R32, the outdoor heat exchanger is a stacked heat exchanger having a plurality of flat tubes arrayed so as to be superposed set apart by gaps, and fins having notches formed therein where the flat tubes are inserted, and wherein the refrigeration apparatus comprises a switching mechanism for switching the direction of refrigerant flow in the refrigeration apparatus. a capacity of the outdoor heat exchanger, which is the liquid refrigerant quantity that can be accommodated in the outdoor heat exchanger, is less than a capacity of the indoor heat exchanger, which is the liquid refrigerant quantity that can be accommodated in the indoor heat exchanger; the expansion mechanisms (24, 26) include an upstream-side expansion mechanism for depressurizing the refrigerant that has radiated heat in the outdoor heat exchanger to an intermediate pressure in the refrigeration cycle, and a downstream-side expansion mechanism for depressurizing the refrigerant that has been depressurized in the upstream-side expansion mechanism and temporarily stored in a refrigerant storage tank to a low pressure in the refrigeration cycle; and wherein the refrigerant storage tank is provided between the upstream-side expansion mechanism and the downstream-side expansion mechanism; wherein the refrigeration apparatus further comprising a control part for performing an operation control, wherein the refrigeration apparatus is configured to control the cooling operation by means of the control part, wherein the refrigerant depressurized by the upstream-side expansion mechanism to the intermediate pressure in the refrigerant cycle is stored in the refrigerant storage tank and an excess refrigerant produced during the cooling operation due to the capacity of the outdoor heat exchanger being less than the capacity of the indoor heat exchanger is accommodated in the refrigerant storage tank, the refrigeration apparatus further comprising an outdoor unit, an indoor unit and liquid refrigerant communication tube, wherein the outdoor heat exchanger, upstream-side expansion mechanism and the downstream-side expansion mechanism are provided in the outdoor unit, and the indoor heat exchanger is provided in the indoor unit, and the indoor unit and the outdoor unit are connected via the liquid refrigerant communication tube; wherein the refrigerant is R32, the outdoor heat exchanger is a stacked heat exchanger having a plurality of flat tubes arrayed so as to be superposed set apart by gaps, and fins having notches formed therein where the flat tubes are inserted, and wherein the refrigeration apparatus comprises a switching mechanism for switching the direction of refrigerant flow in the refrigeration apparatus.