A refrigeration apparatus (10, 110) for using R32 as the refrigerant, the refrigeration apparatus comprising: a compressor configured to suck in low-pressure refrigerant from a suction passage, and compress the refrigerant and discharging 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); an intermediate injection channel (65, 265) configured to guide a part of the refrigerant flowing from the condenser (30, 50) toward the evaporator to the compressor, and cause the refrigerant to merge with intermediate-pressure refrigerant of the compressor; a suction injection channel (67, 267) configured to guide a part of the refrigerant flowing from the condenser (30, 50) toward the evaporator to the suction passage, and cause the refrigerant to merge with low-pressure refrigerant sucked into the compressor; switching mechanism (66, 68, 266, 268) configured to switch between an intermediate injection condition that flows refrigerant in the intermediate injection channel (65, 265), and a suction injection condition that flows refrigerant in the suction injection channel (67, 267); and a first discharge temperature sensor configured to detect the temperature of the refrigerant discharged from the compressor, characterized by a control unit, configured to selectively implement an intermediate injection control for keeping the switching mechanism in the intermediate injection condition and flowing refrigerant to the intermediate injection channel (65, 265), or suction injection control for keeping the switching mechanism in a suction injection condition and flowing refrigerant to the suction injection channel (67, 267), wherein the control unit is configured to perform the suction injection control when the discharge temperature detected by the discharge temperature sensor is higher than a temperature threshold value, and the rotational speed of the compressor is below a rotational speed threshold value. a compressor configured to suck in low-pressure refrigerant from a suction passage, and compress the refrigerant and discharging 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); an intermediate injection channel (65, 265) configured to guide a part of the refrigerant flowing from the condenser (30, 50) toward the evaporator to the compressor, and cause the refrigerant to merge with intermediate-pressure refrigerant of the compressor; a suction injection channel (67, 267) configured to guide a part of the refrigerant flowing from the condenser (30, 50) toward the evaporator to the suction passage, and cause the refrigerant to merge with low-pressure refrigerant sucked into the compressor; switching mechanism (66, 68, 266, 268) configured to switch between an intermediate injection condition that flows refrigerant in the intermediate injection channel (65, 265), and a suction injection condition that flows refrigerant in the suction injection channel (67, 267); and a first discharge temperature sensor configured to detect the temperature of the refrigerant discharged from the compressor, characterized by a control unit, configured to selectively implement an intermediate injection control for keeping the switching mechanism in the intermediate injection condition and flowing refrigerant to the intermediate injection channel (65, 265), or suction injection control for keeping the switching mechanism in a suction injection condition and flowing refrigerant to the suction injection channel (67, 267), an intermediate injection control for keeping the switching mechanism in the intermediate injection condition and flowing refrigerant to the intermediate injection channel (65, 265), or suction injection control for keeping the switching mechanism in a suction injection condition and flowing refrigerant to the suction injection channel (67, 267), wherein the control unit is configured to perform the suction injection control when the discharge temperature detected by the discharge temperature sensor is higher than a temperature threshold value, and the rotational speed of the compressor is below a rotational speed threshold value.