A power converter is composed of a converter and a filter capacitor. The converter is composed by combining a plurality of semiconductor devices and comprises the following components: a positive side and a negative side which forms an input side, and an AC side which forms an output side. The filter capacitor is connected between the positive side and the negative side through a positive side conductor and a negative side conductor. The positive side conductor and the negative side conductor are provided with a group of connection parts at the diagonal positions and are formed to rectangle flat. Each conductor surface is configured parallelly with one another in a same direction according to a mode that the lines for connecting the group of connection parts are crossed. One connection part of each conductor is connected with the filter capacitor, and furthermore the other connection part of each conductor is connected with the positive side and the negative side.