A refrigeration apparatus comprising: a first cooling section disposed such that a first compressor, a first condenser (62H, 63H), a first expander, and a first evaporator achieve fluid communication with one another in a first fluid circuit through which a first refrigerant circulates; a second cooling section disposed such that a second compressor, a second condenser (72L, 73L) that constitutes a cascade condenser in cooperation with the first evaporator, a second expander, and a second evaporator achieve fluid communication with one another in a second fluid circuit through which a second refrigerant circulates; a storage section that includes a storage space for a cooling target cooled by the second evaporator; an internal temperature sensor that detects a temperature of the storage space; a control section that determines a second rotation speed of the second compressor based on a target temperature of the storage space and a detection result obtained by the internal temperature sensor, and determines a first rotation speed of the first compressor; and a first power supply section and a second power supply section that supply power to the first compressor and the second compressor, respectively, based on the first rotation speed and the second rotation speed determined by the control section, respectively, characterized in that the control section is configured to determine the first rotation speed of the first compressor based on the determined second rotation speed of the second compressor, and the first rotation speed has a predetermined correspondence relation with the second rotation speed. a first cooling section disposed such that a first compressor, a first condenser (62H, 63H), a first expander, and a first evaporator achieve fluid communication with one another in a first fluid circuit through which a first refrigerant circulates; a second cooling section disposed such that a second compressor, a second condenser (72L, 73L) that constitutes a cascade condenser in cooperation with the first evaporator, a second expander, and a second evaporator achieve fluid communication with one another in a second fluid circuit through which a second refrigerant circulates; a storage section that includes a storage space for a cooling target cooled by the second evaporator; an internal temperature sensor that detects a temperature of the storage space; a control section that determines a second rotation speed of the second compressor based on a target temperature of the storage space and a detection result obtained by the internal temperature sensor, and determines a first rotation speed of the first compressor; and a first power supply section and a second power supply section that supply power to the first compressor and the second compressor, respectively, based on the first rotation speed and the second rotation speed determined by the control section, respectively, characterized in that the control section is configured to determine the first rotation speed of the first compressor based on the determined second rotation speed of the second compressor, and the first rotation speed has a predetermined correspondence relation with the second rotation speed.