A charging apparatus capable of reducing low-frequency leakage current includes: a power factor correction converter including a switch, wherein the power factor correction converter converts an AC power inputted by an on/off control of the switch into a DC power by correcting a power factor of the AC power; a DC-DC converter changing a magnitude of voltage outputted from the power factor correction converter into a magnitude of voltage required by an energy storage device to be charged; a first duty controller determining a first duty value of the switch for outputting a voltage having a predetermined magnitude through the power factor correction converter based on a magnitude of a differential mode component of the AC power; and a second duty controller determining a second duty value of the switch for removing a common-mode component of the AC power based on the common-mode component.