Abstract: A power conversion device includes a power stage which includes N (N is a natural number equal to or more than 3) upper switches arranged in parallel with each other and N lower switches arranged in parallel with each other and generates an output voltage having a voltage level different from that of an input voltage according to on and off of the upper switches and the lower switches, and a controller which generates gate control signals for the upper switches and the lower switches, alternately turns on and off the upper switches and the lower switches by using the gate control signals, and controls the gate control signals so that the respective upper switches are turned on at different time points and the respective lower switches are turned on at different time points in every control period.