Abstract: A compressor driving apparatus comprises a module including a power supply, an inverter for driving a compressor, an inverter driver for driving the inverter, a CPU for generating a signal to be used for driving the inverter and having a function for communicating with outside, a storage circuit for storing data which is alterable from an external device, and a relay driver for driving an external relay. The inverter and other circuit components are disposed within the module such that they are thermally separate such that an inverter driving signal from the CPU is transferred accurately to the inverter and that a power supply having an output voltage with low distortion is realized, thereby improving the operating efficiency of the compressor. Because the storage circuit and the power supply circuit are built-in, standardization of the compressor driving apparatus is easily realized.