A power supply device includes a voltage output unit configured to output a DC voltage corresponding to a control signal from a first controller and an output evaluator configured to perform a judgment process of judging whether or not the DC voltage is a voltage corresponding to a set value received from the fist controller, and to output a result of the judgment to the first controller. The output evaluator includes a storage for storing correspondence information which shows a correspondence relationship between the set value and a voltage value of the DC voltage outputted from the voltage output unit. The output evaluator performs the judgment process by outputting the correspondence information to the first controller, and receiving a set value determined on the basis of the correspondence information from the first controller.