A refrigerating apparatus, comprising: a first refrigerant circuit including a first compressor, a first condenser, a first decompressor, and a first evaporator, connected circularly with a first piping to form a refrigerating cycle, the first refrigerant circuit having a first refrigerant sealed therein as a working refrigerant; a second refrigerant circuit including a second compressor, a second condenser, a second decompressor, and a second evaporator, connected circularly with a second piping to form a refrigerating cycle, the second refrigerant circuit having a second refrigerant sealed therein as a working refrigerant; a first controller (204, 210) configured to control an operation performance of the first compressor in a variable manner; and a second controller (205, 210) configured to control an operation performance of the second compressor in a variable manner; the refrigerating apparatus further comprising a first sensor configured to detect a temperature of a cascade condenser constituted by integrating the first evaporator and the second condenser in a heat exchangeable manner; the first controller (204, 210) being configured to control the operation performance of the first compressor in a variable manner based on the temperature detected by the first sensor in order that the temperature detected by the first sensor is a first temperature; characterized in that the refrigerating apparatus is keeping a temperature inside a storage at a predetermined low temperature state and is further comprising a second sensor configured to detect a temperature inside the storage; the second controller (205, 210) being configured to control the operation performance of the second compressor in a variable manner based on the temperature detected by the second sensor in order that the temperature detected by the second sensor is a second temperature. a first refrigerant circuit including a first compressor, a first condenser, a first decompressor, and a first evaporator, connected circularly with a first piping to form a refrigerating cycle, the first refrigerant circuit having a first refrigerant sealed therein as a working refrigerant; a second refrigerant circuit including a second compressor, a second condenser, a second decompressor, and a second evaporator, connected circularly with a second piping to form a refrigerating cycle, the second refrigerant circuit having a second refrigerant sealed therein as a working refrigerant; a first controller (204, 210) configured to control an operation performance of the first compressor in a variable manner; and a second controller (205, 210) configured to control an operation performance of the second compressor in a variable manner; the refrigerating apparatus further comprising a first sensor configured to detect a temperature of a cascade condenser constituted by integrating the first evaporator and the second condenser in a heat exchangeable manner; the first controller (204, 210) being configured to control the operation performance of the first compressor in a variable manner based on the temperature detected by the first sensor in order that the temperature detected by the first sensor is a first temperature; characterized in that the refrigerating apparatus is keeping a temperature inside a storage at a predetermined low temperature state and is further comprising a second sensor configured to detect a temperature inside the storage; the second controller (205, 210) being configured to control the operation performance of the second compressor in a variable manner based on the temperature detected by the second sensor in order that the temperature detected by the second sensor is a second temperature.