A power conversion device for converting DC voltage inputted from a DC power supply, to three-phase AC voltage, the power conversion device comprising: a first-phase conversion device configured to convert the DC voltage inputted from the DC power supply, to voltage having an AC waveform to be outputted to a first phase with respect to a neutral point of three-phase AC; a second-phase conversion device configured to convert the DC voltage inputted from the DC power supply, to voltage having an AC waveform to be outputted to a second phase with respect to the neutral point; a third-phase conversion device configured to convert the DC voltage inputted from the DC power supply, to voltage having an AC waveform to be outputted to a third phase with respect to the neutral point; and a control unit configured to control the first-phase conversion device, the second-phase conversion device, and the third-phase conversion device, wherein each of the first-phase conversion device, the second-phase conversion device, and the third-phase conversion device includes: a first converter having a DC/DC converter including an isolation transformer, and a smoothing capacitor, the first converter configured to convert, by the DC/DC converter controlled by the control unit, the inputted DC voltage to a first voltage waveform containing a part of an absolute value of every half cycle of the AC waveform; and a second converter provided at a stage subsequent to the first converter and having a full-bridge inverter, the second converter configured to invert, by the full-bridge inverter controlled by the control unit, a polarity of the first voltage waveform, per one cycle, thereby converting the first voltage waveform to a second voltage waveform having the AC waveform, wherein during a period in which the voltage value of the first voltage waveform is equal to or lower than a predetermined proportion of a wave crest value of the AC waveform, the control unit is configured to cause the full-bridge inverter to perform switching operation at a high frequency, thereby causing the second converter to generate a voltage having the AC waveform in the period. a first-phase conversion device configured to convert the DC voltage inputted from the DC power supply, to voltage having an AC waveform to be outputted to a first phase with respect to a neutral point of three-phase AC; a second-phase conversion device configured to convert the DC voltage inputted from the DC power supply, to voltage having an AC waveform to be outputted to a second phase with respect to the neutral point; a third-phase conversion device configured to convert the DC voltage inputted from the DC power supply, to voltage having an AC waveform to be outputted to a third phase with respect to the neutral point; and a control unit configured to control the first-phase conversion device, the second-phase conversion device, and the third-phase conversion device, wherein each of the first-phase conversion device, the second-phase conversion device, and the third-phase conversion device includes: a first converter having a DC/DC converter including an isolation transformer, and a smoothing capacitor, the first converter configured to convert, by the DC/DC converter controlled by the control unit, the inputted DC voltage to a first voltage waveform containing a part of an absolute value of every half cycle of the AC waveform; and a second converter provided at a stage subsequent to the first converter and having a full-bridge inverter, the second converter configured to invert, by the full-bridge inverter controlled by the control unit, a polarity of the first voltage waveform, per one cycle, thereby converting the first voltage waveform to a second voltage waveform having the AC waveform, wherein a first converter having a DC/DC converter including an isolation transformer, and a smoothing capacitor, the first converter configured to convert, by the DC/DC converter controlled by the control unit, the inputted DC voltage to a first voltage waveform containing a part of an absolute value of every half cycle of the AC waveform; and a second converter provided at a stage subsequent to the first converter and having a full-bridge inverter, the second converter configured to invert, by the full-bridge inverter controlled by the control unit, a polarity of the first voltage waveform, per one cycle, thereby converting the first voltage waveform to a second voltage waveform having the AC waveform, wherein during a period in which the voltage value of the first voltage waveform is equal to or lower than a predetermined proportion of a wave crest value of the AC waveform, the control unit is configured to cause the full-bridge inverter to perform switching operation at a high frequency, thereby causing the second converter to generate a voltage having the AC waveform in the period.