A control unit of an uninterruptible power supply device includes a PWM circuit generating a plurality of PWM signals controlling a plurality of IGBT elements of a power conversion unit; a plurality of output terminals for supplying the plurality of PWM signals to the plurality of IGBTs; and a switching circuit arranging the plurality of PWM signals in order in accordance with the type of the uninterruptible power supply device and supplying the PWM signals to the plurality of output terminals. Accordingly, the control unit can be shared among a plurality of types of uninterruptible power supply devices.