This power converter is provided with a power source main circuit unit (1) provided with a full-wave rectifier circuit (4) and an H-bridge step-up/step-down converter (5), and a power source control unit (2) which controls operation of the power source main circuit unit (1), wherein the power source control unit (2) determines operation of step-up control, step-down control or step-up/step-down control of the H-bridge step-up/step-down converter (5) on the basis of comparison of the input voltage (vin) and the output voltage (vo), computes a target reactor current (iL*) for performing power factor improvement control differently depending on whether step-up control, step-down control or step-up/step-down control is being performed, and performs current control to match the reactor current (iL) to the target reactor current (iL*).