A power conversion device includes M number of DC/DC converters, first-side terminals of the DC/DC converters are connected so that common current flows between both positive and negative terminals of first DC terminals of the power conversion device, and second-side terminals thereof are connected so that common current flows between both positive and negative terminals of second DC terminals of the power conversion device. The power conversion device further includes M-1 number of auxiliary converters each connected between two DC/DC converters and performing DC/DC conversion. The DC/DC converters control voltages of the second-side terminals and input voltage of the power conversion device. Each auxiliary converter controls voltages of the first-side terminals of the two DC/DC converters so as to be equalized.