The present invention relates to a power converter comprising a power conversion unit (3) having an n-phase alternating current output (n is an integer number with n>=2) connected to a direct current power source (1), and smoothing means (2) provided between the current power source and the power conversion unit, and to a power unit. The power converting unit includes a controller for controllingsuch that the total phase difference of a power waveform of each phase is matched to the value for dividing the cycle of the power waveform into n-equal portions, and the total power value of each phase is controlled to be the same.