A power conversion device comprising: a power conversion circuit that is adapted to use a three phase AC power source as an input and has a plurality of bidirectional switches each of which is connected to each phase of the three phase AC power source; a switching control circuit that is adapted to control states of the plurality of bidirectional switches and to switch a combination of two phases of the three phase AC power source, relating to interphase voltage to be output from the power conversion circuit to a load side; and a resonant circuit that is connected to an output side of the power conversion circuit, wherein the switching control circuit is adapted to, at a time of switching of the combination of the two phases that output the interphase voltage to the load side, switch the states of the plurality of bidirectional switches relating to the time of switching, by soft switching, characterized in that the switching control circuit is configured to switch the combination of two phases of the three phase AC power source so that all of the combinations of two phases are output in time of each section of six patterns classified according to the magnitude of the voltage of each phase of the three phase AC power source, each section being divided into a plurality of timings for switching the combination of bidirectional switches so that the interphase voltage of a polarity reversal is output from the power conversion circuit such that a resonant frequency of the resonant circuit is substantially the same as a frequency of the interphase voltage output from the power conversion circuit to the load side, and configured to control the states of the plurality of bidirectional switches. a power conversion circuit that is adapted to use a three phase AC power source as an input and has a plurality of bidirectional switches each of which is connected to each phase of the three phase AC power source; a switching control circuit that is adapted to control states of the plurality of bidirectional switches and to switch a combination of two phases of the three phase AC power source, relating to interphase voltage to be output from the power conversion circuit to a load side; and a resonant circuit that is connected to an output side of the power conversion circuit, wherein the switching control circuit is adapted to, at a time of switching of the combination of the two phases that output the interphase voltage to the load side, switch the states of the plurality of bidirectional switches relating to the time of switching, by soft switching, characterized in that the switching control circuit is configured to switch the combination of two phases of the three phase AC power source so that all of the combinations of two phases are output in time of each section of six patterns classified according to the magnitude of the voltage of each phase of the three phase AC power source, each section being divided into a plurality of timings for switching the combination of bidirectional switches so that the interphase voltage of a polarity reversal is output from the power conversion circuit such that a resonant frequency of the resonant circuit is substantially the same as a frequency of the interphase voltage output from the power conversion circuit to the load side, and configured to control the states of the plurality of bidirectional switches.