A power conversion device provided between a DC power supply and an AC electric path and performing DC/AC power conversion in a state in which a DC voltage of the DC power supply is lower than a peak value of an AC voltage of the AC electric path, the power conversion device comprising: a DC/DC converter provided between the DC power supply and a DC bus; an intermediate capacitor connected to the DC bus and having such a small capacitance as not to smooth a pulsation that is included in a voltage of the DC bus and has a frequency twice as high as a frequency of the AC voltage; an inverter connected to the DC bus; a filter circuit provided between the inverter and the AC electric path and having an AC reactor and an AC-side capacitor; a current sensor configured to detect a current flowing through the AC reactor; and a control unit configured to perform control such that, for generating the AC voltage from the DC voltage, a period during which the DC/DC converter boosts the DC voltage and the inverter performs one of polarity non-inversion passing and polarity inversion passing, and a period during which the DC/DC converter is stopped and the inverter performs step-down operation and one of polarity non-inversion passing and polarity inversion passing, arise alternately in one AC cycle, characterized in that: the control unit further configured to temporarily perform gate blocking for only the DC/DC converter, in every half of the AC cycle upon occurrence of a phenomenon in which, by start of power feeding to a load connected to the AC electric path, an absolute value of the current flowing through the AC reactor reaches a predetermined converter gate block threshold value lower than an instantaneous overcurrent protection threshold value, and to cancel the gate blocking at the next zero-cross time of the AC voltage. a DC/DC converter provided between the DC power supply and a DC bus; an intermediate capacitor connected to the DC bus and having such a small capacitance as not to smooth a pulsation that is included in a voltage of the DC bus and has a frequency twice as high as a frequency of the AC voltage; an inverter connected to the DC bus; a filter circuit provided between the inverter and the AC electric path and having an AC reactor and an AC-side capacitor; a current sensor configured to detect a current flowing through the AC reactor; and a control unit configured to perform control such that, for generating the AC voltage from the DC voltage, a period during which the DC/DC converter boosts the DC voltage and the inverter performs one of polarity non-inversion passing and polarity inversion passing, and a period during which the DC/DC converter is stopped and the inverter performs step-down operation and one of polarity non-inversion passing and polarity inversion passing, arise alternately in one AC cycle, characterized in that: the control unit further configured to temporarily perform gate blocking for only the DC/DC converter, in every half of the AC cycle upon occurrence of a phenomenon in which, by start of power feeding to a load connected to the AC electric path, an absolute value of the current flowing through the AC reactor reaches a predetermined converter gate block threshold value lower than an instantaneous overcurrent protection threshold value, and to cancel the gate blocking at the next zero-cross time of the AC voltage.