A power conversion device which has a reactor, an inverter, and a converter, and which performs power conversion between AC voltage of an AC power supply and DC voltage of a smoothing capacitor, - wherein the inverter includes inverter AC terminals (5e, 5f), a DC capacitor, and switch elements (5a to 5d), and switches a voltage level between the inverter AC terminals (5e, 5f) to a positive/negative value of voltage of the DC capacitor, or zero voltage, through switching operations of the switch elements (5a to 5d), and - the converter includes converter AC terminals (6e, 6f) connected to the AC power supply via the reactor and the inverter AC terminals (5e, 5f) connected in series to each other, converter DC terminals (6g, 6h) connected to the smoothing capacitor, and switch elements (6b, 6d), and switches a voltage level between the converter AC terminals (6e, 6f) to a positive/negative value of voltage of the smoothing capacitor, or zero voltage, through switching operations of the switch elements (6b, 6d), - the power conversion device comprising a control unit for controlling the switching operations of the switch elements (5a to 5d) of the inverter and the switch elements (6b, 6d) of the converter, wherein - the control unit controls the switch elements (5a to 5d) of the inverter and the switch elements (6b, 6d) of the converter so that charging operation and discharging operation of the DC capacitor are performed in one switching cycle (Tsw) of the inverter and a charging amount and a discharging amount thereof are equal to each other, and wherein the control unit divides one switching cycle (Tsw) of the inverter into an even number of periods including one or a plurality of pairs of periods, each pair of periods being composed of a current increase period in which current of the AC power supply increases and a current decrease period in which current of the AC power supply decreases, and the control unit includes: a theoretical duty calculator which calculates a theoretical duty 1 corresponding to a time width of the current increase period relative to a time width of the pair of periods, and a theoretical duty 2 corresponding to a time width of the current decrease period relative to a time width of the pair of periods, so that a current increase amount in the current increase period and a current decrease amount in the current decrease period are equal to each other in the pair of periods; and a gate signal calculator which calculates gate signals (G5a to G5d, G6b, G6d) for driving the switch elements (5a to 5d) of the inverter and the switch elements (6b, 6d) of the converter to perform switching, on the basis of the theoretical duty 1 and the theoretical duty 2. - wherein the inverter includes inverter AC terminals (5e, 5f), a DC capacitor, and switch elements (5a to 5d), and switches a voltage level between the inverter AC terminals (5e, 5f) to a positive/negative value of voltage of the DC capacitor, or zero voltage, through switching operations of the switch elements (5a to 5d), and - the converter includes converter AC terminals (6e, 6f) connected to the AC power supply via the reactor and the inverter AC terminals (5e, 5f) connected in series to each other, converter DC terminals (6g, 6h) connected to the smoothing capacitor, and switch elements (6b, 6d), and switches a voltage level between the converter AC terminals (6e, 6f) to a positive/negative value of voltage of the smoothing capacitor, or zero voltage, through switching operations of the switch elements (6b, 6d), - the power conversion device comprising a control unit for controlling the switching operations of the switch elements (5a to 5d) of the inverter and the switch elements (6b, 6d) of the converter, wherein - the control unit controls the switch elements (5a to 5d) of the inverter and the switch elements (6b, 6d) of the converter so that charging operation and discharging operation of the DC capacitor are performed in one switching cycle (Tsw) of the inverter and a charging amount and a discharging amount thereof are equal to each other, and wherein the control unit divides one switching cycle (Tsw) of the inverter into an even number of periods including one or a plurality of pairs of periods, each pair of periods being composed of a current increase period in which current of the AC power supply increases and a current decrease period in which current of the AC power supply decreases, and the control unit includes: a theoretical duty calculator which calculates a theoretical duty 1 corresponding to a time width of the current increase period relative to a time width of the pair of periods, and a theoretical duty 2 corresponding to a time width of the current decrease period relative to a time width of the pair of periods, so that a current increase amount in the current increase period and a current decrease amount in the current decrease period are equal to each other in the pair of periods; and a gate signal calculator which calculates gate signals (G5a to G5d, G6b, G6d) for driving the switch elements (5a to 5d) of the inverter and the switch elements (6b, 6d) of the converter to perform switching, on the basis of the theoretical duty 1 and the theoretical duty 2.