A power conversion device, comprising: a rectifier configured to convert an AC voltage into a DC voltage and output the DC voltage; a resistance value changing circuit configured to receive input of the DC voltage, including a resistor and a relay connected in parallel to the resistor, and in which a resistance value is changed by an operation of the relay; a booster circuit configured to boost the DC voltage output from the resistance value changing circuit; a smoothing capacitor configured to smooth the DC voltage output from the booster circuit, the booster circuit including a reactor connected in series to the resistance value changing circuit, a first backflow prevention device and a second backflow prevention device being formed as diodes and connecting the reactor and one end of the smoothing capacitor to allow an electric current to flow from the reactor side to the smoothing capacitor side, the first backflow prevention device and the second backflow prevention device being connected in series to each other, a first switching device and a second switching device, connecting the reactor and an other end of the smoothing capacitor, the first switching device and the second switching device being connected in series to each other, and an intermediate capacitor connecting a point between the first backflow prevention device and the second backflow prevention device and a point between the first switching device and the second switching device; and a drive circuit configured to generate a control power source to drive the first switching device and the second switching device with the control power source, when a power supply is turned on, the drive circuit being configured to generate the control power source, a charging time of the smoothing capacitor being delayed by changing the resistance value, and characterized in that the charging of the intermediate capacitor is started before a charging voltage of the smoothing capacitor.is equal to a voltage rectified by the rectifier. a rectifier configured to convert an AC voltage into a DC voltage and output the DC voltage; a resistance value changing circuit configured to receive input of the DC voltage, including a resistor and a relay connected in parallel to the resistor, and in which a resistance value is changed by an operation of the relay; a booster circuit configured to boost the DC voltage output from the resistance value changing circuit; a smoothing capacitor configured to smooth the DC voltage output from the booster circuit, the booster circuit including a reactor connected in series to the resistance value changing circuit, a first backflow prevention device and a second backflow prevention device being formed as diodes and connecting the reactor and one end of the smoothing capacitor to allow an electric current to flow from the reactor side to the smoothing capacitor side, the first backflow prevention device and the second backflow prevention device being connected in series to each other, a first switching device and a second switching device, connecting the reactor and an other end of the smoothing capacitor, the first switching device and the second switching device being connected in series to each other, and an intermediate capacitor connecting a point between the first backflow prevention device and the second backflow prevention device and a point between the first switching device and the second switching device; and a reactor connected in series to the resistance value changing circuit, a first backflow prevention device and a second backflow prevention device being formed as diodes and connecting the reactor and one end of the smoothing capacitor to allow an electric current to flow from the reactor side to the smoothing capacitor side, the first backflow prevention device and the second backflow prevention device being connected in series to each other, a first switching device and a second switching device, connecting the reactor and an other end of the smoothing capacitor, the first switching device and the second switching device being connected in series to each other, and an intermediate capacitor connecting a point between the first backflow prevention device and the second backflow prevention device and a point between the first switching device and the second switching device; and a drive circuit configured to generate a control power source to drive the first switching device and the second switching device with the control power source, when a power supply is turned on, the drive circuit being configured to generate the control power source, a charging time of the smoothing capacitor being delayed by changing the resistance value, and characterized in that the charging of the intermediate capacitor is started before a charging voltage of the smoothing capacitor.is equal to a voltage rectified by the rectifier.