A power converter that outputs AC voltage on the basis of an AC output voltage command, comprising: a single-phase AC power source having a first AC terminal and a second AC terminal; a DC power source series circuit, resulting from connecting in series a first DC power source and a second DC power source such that a neutral terminal, which is a connection point of the first DC power source and the second DC power source, is connected to the second AC terminal; a switching element series circuit resulting from connecting in series a positive-side switching element that is connected to a positive-side terminal of the DC power source series circuit, and a negative-side switching element that is connected to a negative-side terminal of the DC power source series circuit; a first AC output terminal connected to a connection point of the positive-side switching element and the negative-side switching element; a second AC output terminal connected to the neutral terminal; and a bidirectional switch element one end of which is connected to the first AC output terminal and the other end of which is connected to a first AC terminal of the AC power source, wherein at each control period resulting from dividing one period of the AC output voltage command into a plurality of control periods each having a pre-established time width, the power converter sets, as a first voltage, a voltage of one level selected from among three levels of voltage of a positive-side voltage of the DC power source series circuit, a negative-side voltage of the DC power source series circuit, and a voltage of the AC power source, sets, as a second voltage, the voltage of another level selected from among the three levels of voltage, and complementarily outputs the first voltage and the second voltage to the first AC output terminal, over respective predefined time widths; wherein the first voltage and the second voltage are voltages selected on the basis of the AC output voltage command and the voltage of the AC power source; characterized in that wherein an output time [T H1] of the first voltage is a time corresponding to a value obtained by dividing a difference voltage between the AC output voltage command and the second voltage by a difference voltage between the first voltage and the second voltage, and an output time [T L1] of the second voltage is a time resulting from subtracting the output time of the first voltage from the time of each control period. a single-phase AC power source having a first AC terminal and a second AC terminal; a DC power source series circuit, resulting from connecting in series a first DC power source and a second DC power source such that a neutral terminal, which is a connection point of the first DC power source and the second DC power source, is connected to the second AC terminal; a switching element series circuit resulting from connecting in series a positive-side switching element that is connected to a positive-side terminal of the DC power source series circuit, and a negative-side switching element that is connected to a negative-side terminal of the DC power source series circuit; a first AC output terminal connected to a connection point of the positive-side switching element and the negative-side switching element; a second AC output terminal connected to the neutral terminal; and a bidirectional switch element one end of which is connected to the first AC output terminal and the other end of which is connected to a first AC terminal of the AC power source, wherein at each control period resulting from dividing one period of the AC output voltage command into a plurality of control periods each having a pre-established time width, the power converter sets, as a first voltage, a voltage of one level selected from among three levels of voltage of a positive-side voltage of the DC power source series circuit, a negative-side voltage of the DC power source series circuit, and a voltage of the AC power source, sets, as a second voltage, the voltage of another level selected from among the three levels of voltage, and complementarily outputs the first voltage and the second voltage to the first AC output terminal, over respective predefined time widths; wherein the first voltage and the second voltage are voltages selected on the basis of the AC output voltage command and the voltage of the AC power source; characterized in that wherein an output time [T H1] of the first voltage is a time corresponding to a value obtained by dividing a difference voltage between the AC output voltage command and the second voltage by a difference voltage between the first voltage and the second voltage, and an output time [T L1] of the second voltage is a time resulting from subtracting the output time of the first voltage from the time of each control period.