contactless battery charger

A contactless battery charger is provided with a power feeding device having a power feeding coil to generate a magnetic flux using an inputted alternating current and with a power receiving device having a power receiving coil disposed so as to confront the power feeding coil. The contactless battery charger supplies an electric power using electromagnetic induction between the power feeding coil and the power receiving coil. Each of the power feeding coil and the power receiving coil is formed by winding a litz wire made up of a plurality of element wires. A width of the litz wire of the power feeding coil is smaller than a width of the litz wire of the power receiving coil in a first direction along opposing faces of the power feeding coil and the power receiving coil. The power receiving coil has an external diameter greater than or equal to that of the power feeding coil.