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 (Psp) and a second DC power source (Psn) such that a neutral terminal, which is a connection point of the first DC power source (Psp) and the second DC power source (Psn), 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; a first bidirectional switch element one end of which is connected to the first AC output terminal and the other end of which is connected to the first AC terminal of the AC power source; and a second bidirectional switch element one end of which is connected to the first AC output terminal and the other end of which is connected to the neutral terminal of the DC power source series circuit, wherein the power converter outputs, to the first AC output terminal, voltage of any one level selected from among four 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, zero voltage being the potential of the neutral terminal, and a voltage of the AC power source by selectively turning on any one element from among the switching elements (Q1, Q2) of the switching element series circuit and the bidirectional switch elements (S1, S2) and turning off the other three elements. 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 (Psp) and a second DC power source (Psn) such that a neutral terminal, which is a connection point of the first DC power source (Psp) and the second DC power source (Psn), 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; a first bidirectional switch element one end of which is connected to the first AC output terminal and the other end of which is connected to the first AC terminal of the AC power source; and a second bidirectional switch element one end of which is connected to the first AC output terminal and the other end of which is connected to the neutral terminal of the DC power source series circuit, wherein the power converter outputs, to the first AC output terminal, voltage of any one level selected from among four 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, zero voltage being the potential of the neutral terminal, and a voltage of the AC power source by selectively turning on any one element from among the switching elements (Q1, Q2) of the switching element series circuit and the bidirectional switch elements (S1, S2) and turning off the other three elements.