A power converter, comprising: - an inverter for converting electric power output from a power supply; - a first power feeding bus connected to the inverter and positive side of the power supply; - a second power feeding bus connected to the inverter and negative side of the power supply; - a smoothing capacitor connected between the first power feeding bus and the second power feeding bus; and - a plurality of connection circuits (21, 22) each including a resistant member and a capacitive member which are connected in series, wherein: - the plurality of connection circuits (21, 22) are connected between the first power feeding bus and the second power feeding bus, have at least two or more different impedances (Z 1, Z 2), and are connected to different positions in the longitudinal direction of the first power feeding bus and the second power feeding bus, and characterized in that - the plurality of connection circuits (21, 22) includes a first connection circuit and a second connection circuit, - the first connection circuit is connected to the first power feeding bus and the second power feeding bus, wherein each of a connection point to the first power feeding bus and a connection point to the second power feeding bus is considered as a first connection point, - the second connection circuit is connected to the first power feeding bus and the second power feeding bus, wherein each of a connection point to the first power feeding bus and a connection point to the second power feeding bus is considered as a second connection point, - the first connection point is positioned between a first antinode and a first node of a standing wave, - the second connection point is positioned between a second antinode and a second node of the standing wave, - the standing wave is an oscillatory voltage wave that transmits through the first power feeding bus and the second power feeding bus, and is generated by switching operation by the inverter and an antinode of the standing wave is located to the ends in the longitudinal direction of the power feeding buses (11, 12), - a distance (d 1) from the first antinode of the standing wave to the first connection point is shorter than a distance (d 2) from the second antinode of the standing wave to the second connection point, and - the impedance (Z 1) of the first connection circuit is smaller than the impedance (Z 2) of the second connection circuit. - an inverter for converting electric power output from a power supply; - a first power feeding bus connected to the inverter and positive side of the power supply; - a second power feeding bus connected to the inverter and negative side of the power supply; - a smoothing capacitor connected between the first power feeding bus and the second power feeding bus; and - a plurality of connection circuits (21, 22) each including a resistant member and a capacitive member which are connected in series, - the plurality of connection circuits (21, 22) are connected between the first power feeding bus and the second power feeding bus, have at least two or more different impedances (Z 1, Z 2), and are connected to different positions in the longitudinal direction of the first power feeding bus and the second power feeding bus, and characterized in that - the plurality of connection circuits (21, 22) includes a first connection circuit and a second connection circuit, - the first connection circuit is connected to the first power feeding bus and the second power feeding bus, wherein each of a connection point to the first power feeding bus and a connection point to the second power feeding bus is considered as a first connection point, - the second connection circuit is connected to the first power feeding bus and the second power feeding bus, wherein each of a connection point to the first power feeding bus and a connection point to the second power feeding bus is considered as a second connection point, - the first connection point is positioned between a first antinode and a first node of a standing wave, - the second connection point is positioned between a second antinode and a second node of the standing wave, - the standing wave is an oscillatory voltage wave that transmits through the first power feeding bus and the second power feeding bus, and is generated by switching operation by the inverter and an antinode of the standing wave is located to the ends in the longitudinal direction of the power feeding buses (11, 12), - a distance (d 1) from the first antinode of the standing wave to the first connection point is shorter than a distance (d 2) from the second antinode of the standing wave to the second connection point, and - the impedance (Z 1) of the first connection circuit is smaller than the impedance (Z 2) of the second connection circuit.