An electric power converter apparatus includes an inverter circuit having a plurality of upper arm elements and a plurality of lower arm elements, a feedback controlling module calculating a voltage command value in order to control an output from the inverter circuit in a feedback control manner and a compensating module compensating the voltage command value with a compensation amount and outputting a compensated voltage command value. Each of the plurality of upper arm elements and the plurality of lower arm elements is operated to switch over based on a control signal that is set according to the compensated voltage command value and a dead time. The compensation amount is set by the compensating module in order to compensate a fluctuation in the output current due to the dead time.