A wireless charging device includes a plurality of charging coils, a plurality of position detection coils corresponding respectively to the charging coils, and a voltage monitoring circuit for measuring a coil-end voltage of each of the position detection coils. A comparison is performed between a coil-end voltage of a first position detection coil corresponding to a charging coil used for charging and a coil-end voltage of a position detection coil adjacent to the first position detection coil, and, depending on a result of the comparison, a charging coil to be used for charging is switched to an adjacent charging coil.