An inverter device that receives DC power from a DC common bus and drives a load, comprising: a first positive-side DC terminal and a first negative-side DC terminal that receive DC power from the DC common bus; a second positive-side DC terminal that is different from the first positive-side DC terminal; a smoothing capacitor that stores DC power supplied from the first positive-side DC terminal and the first negative-side DC terminal; a DC/AC conversion unit that converts DC power supplied from the smoothing capacitor to AC power; and a current-path changing unit that includes: a switching element that is arranged on a first current path in which current flows through the first positive-side DC terminal during powering; a diode that is arranged on a second current path in which current flows through the second positive-side DC terminal during regeneration; a charging resistor that is arranged on a third current path in which current flows through the first positive-side DC terminal when the smoothing capacitor is initially charged; and a resistor, which is connected in series with the diode between the second positive-side DC terminal and a positive-side input of the DC/AC conversion unit, wherein an external resistor is connected between the first positive-side DC terminal and the second positive-side DC terminal such that the first positive-side DC terminal becomes an end whose potential is same as that of a positive-side bus of the DC common bus. a first positive-side DC terminal and a first negative-side DC terminal that receive DC power from the DC common bus; a second positive-side DC terminal that is different from the first positive-side DC terminal; a smoothing capacitor that stores DC power supplied from the first positive-side DC terminal and the first negative-side DC terminal; a DC/AC conversion unit that converts DC power supplied from the smoothing capacitor to AC power; and a current-path changing unit that includes: a switching element that is arranged on a first current path in which current flows through the first positive-side DC terminal during powering; a diode that is arranged on a second current path in which current flows through the second positive-side DC terminal during regeneration; a charging resistor that is arranged on a third current path in which current flows through the first positive-side DC terminal when the smoothing capacitor is initially charged; and a resistor, which is connected in series with the diode between the second positive-side DC terminal and a positive-side input of the DC/AC conversion unit, wherein an external resistor is connected between the first positive-side DC terminal and the second positive-side DC terminal such that the first positive-side DC terminal becomes an end whose potential is same as that of a positive-side bus of the DC common bus. a switching element that is arranged on a first current path in which current flows through the first positive-side DC terminal during powering; a diode that is arranged on a second current path in which current flows through the second positive-side DC terminal during regeneration; a charging resistor that is arranged on a third current path in which current flows through the first positive-side DC terminal when the smoothing capacitor is initially charged; and a resistor, which is connected in series with the diode between the second positive-side DC terminal and a positive-side input of the DC/AC conversion unit, wherein an external resistor is connected between the first positive-side DC terminal and the second positive-side DC terminal such that the first positive-side DC terminal becomes an end whose potential is same as that of a positive-side bus of the DC common bus.