A refrigeration apparatus for use of R32 as the refrigerant, the refrigeration apparatus comprising: a compressor configured to suck in low-pressure refrigerant from a suction passage, compress the refrigerant and discharge high-pressure refrigerant; a condenser (30, 50) configured to condense the high-pressure refrigerant discharged from the compressor; an expansion mechanism (42, 41) configured to expand the high-pressure refrigerant exiting the condenser (30, 50); an evaporator (50, 30) configured to evaporate the refrigerant expanded by the expansion mechanism (42, 41); a branch flow channel (62, 162) branching from a main refrigerant channel (11a, 111a) joining the condenser (30, 50) and the evaporator (50, 30); a first opening adjustable valve (63, 263) having an adjustable opening and disposed in the branch flow channel (62, 162); a heat exchanger for injection (64, 264) configured to exchange heat between the refrigerant that flows in the main refrigerant channel and the refrigerant that passes through the first opening adjustable valve of the branch flow channel (62, 162); a first injection channel (65, 265) configured to guide the refrigerant that flows in the branch flow channel (62, 162) and that exits from the heat exchanger for injection (64, 264), to the compressor or the suction passage; a refrigerant storage tank (80, 280) disposed on the main refrigerant channel; and a second injection channel (82, 282) configured to guide the gas component of refrigerant accumulated inside the refrigerant storage tank (80, 280) to the compressor or the suction passage, characterized by a control unit configured to switch between a first injection control that flows refrigerant to primarily the first injection channel (65, 265) and a second injection control that flows refrigerant to primarily the second injection channel (82, 282), wherein the control unit is configured to switch between the first injection control and the second injection control based on the pressure of refrigerant in the main refrigerant channel between the condenser (30, 50) and the expansion mechanism (42, 41), and when the outdoor liquid pipe pressure of the main refrigerant channel is lower than a threshold value, the control unit switches from the first injection control to the second injection control. a compressor configured to suck in low-pressure refrigerant from a suction passage, compress the refrigerant and discharge high-pressure refrigerant; a condenser (30, 50) configured to condense the high-pressure refrigerant discharged from the compressor; an expansion mechanism (42, 41) configured to expand the high-pressure refrigerant exiting the condenser (30, 50); an evaporator (50, 30) configured to evaporate the refrigerant expanded by the expansion mechanism (42, 41); a branch flow channel (62, 162) branching from a main refrigerant channel (11a, 111a) joining the condenser (30, 50) and the evaporator (50, 30); a first opening adjustable valve (63, 263) having an adjustable opening and disposed in the branch flow channel (62, 162); a heat exchanger for injection (64, 264) configured to exchange heat between the refrigerant that flows in the main refrigerant channel and the refrigerant that passes through the first opening adjustable valve of the branch flow channel (62, 162); a first injection channel (65, 265) configured to guide the refrigerant that flows in the branch flow channel (62, 162) and that exits from the heat exchanger for injection (64, 264), to the compressor or the suction passage; a refrigerant storage tank (80, 280) disposed on the main refrigerant channel; and a second injection channel (82, 282) configured to guide the gas component of refrigerant accumulated inside the refrigerant storage tank (80, 280) to the compressor or the suction passage, characterized by a control unit configured to switch between a first injection control that flows refrigerant to primarily the first injection channel (65, 265) and a second injection control that flows refrigerant to primarily the second injection channel (82, 282), wherein the control unit is configured to switch between the first injection control and the second injection control based on the pressure of refrigerant in the main refrigerant channel between the condenser (30, 50) and the expansion mechanism (42, 41), and when the outdoor liquid pipe pressure of the main refrigerant channel is lower than a threshold value, the control unit switches from the first injection control to the second injection control.