A power converter which converts DC power from a DC power source to N-phase AC power, wherein N is an integer greater than or equal to three, the power converter comprising: an inverter circuit that is provided with N series circuits in each of which a positive electrode side switching device that is configured to be connected to a positive electrode side of the DC power source and a negative electrode side switching device that is configured to be connected to a negative electrode side of the DC power source are connected in series and wherein a connection node that connects the positive electrode side switching device and the negative electrode side switching device in series is connected to an electric load of a corresponding phase; a voltage command basic value calculation unit that calculates an AC voltage command basic value for each of the N phases; an offset voltage calculation unit that calculates an offset voltage Voff; a combined voltage command calculation unit that calculates combined AC voltage commands by combining the offset voltage Voff to a respective AC voltage command basic value for each of the N phases; and a switching control unit that controls the switching devices of each of the N phases, based on the combined AC voltage commands, characterized in that the offset voltage calculation unit is configured to calculates a parameter Voff_c according to Voff_c = Vdc / 2 × I_max 2 − I_min 2 / I_max 2 + I_min 2 + Vb_max × I_max 2 + Vb_min × I_min 2 / I_max 2 + I_min 2, or according to Voff_c = Vdc / 2 × I_max + I_min / I_max − I_min + Vb_max × I_max − Vb_min × I_min / I_max − I_min wherein Vdc is a DC voltage of the DC power source, Vb_min and I_min are respectively the voltage command basic value and the current of the phase that has the minimum voltage command basic value, Vb_max and I_max are respectively the voltage command basic value and the current of the phase that has the maximum voltage command basic value; and wherein the offset voltage calculation unit is further configured to calculate a median value in Vb_max, Vb_min,, and Voff_c as the offset voltage Voff. an inverter circuit that is provided with N series circuits in each of which a positive electrode side switching device that is configured to be connected to a positive electrode side of the DC power source and a negative electrode side switching device that is configured to be connected to a negative electrode side of the DC power source are connected in series and wherein a connection node that connects the positive electrode side switching device and the negative electrode side switching device in series is connected to an electric load of a corresponding phase; a voltage command basic value calculation unit that calculates an AC voltage command basic value for each of the N phases; an offset voltage calculation unit that calculates an offset voltage Voff; a combined voltage command calculation unit that calculates combined AC voltage commands by combining the offset voltage Voff to a respective AC voltage command basic value for each of the N phases; and a switching control unit that controls the switching devices of each of the N phases, based on the combined AC voltage commands, characterized in that the offset voltage calculation unit is configured to calculates a parameter Voff_c according to Voff_c = Vdc / 2 × I_max 2 − I_min 2 / I_max 2 + I_min 2 + Vb_max × I_max 2 + Vb_min × I_min 2 / I_max 2 + I_min 2, or according to Voff_c = Vdc / 2 × I_max + I_min / I_max − I_min + Vb_max × I_max − Vb_min × I_min / I_max − I_min wherein Vdc is a DC voltage of the DC power source, Vb_min and I_min are respectively the voltage command basic value and the current of the phase that has the minimum voltage command basic value, Vb_max and I_max are respectively the voltage command basic value and the current of the phase that has the maximum voltage command basic value; and wherein the offset voltage calculation unit is further configured to calculate a median value in Vb_max, Vb_min,, and Voff_c as the offset voltage Voff.