A power transmission system includes a charging station and a power receiving device. The charging station has a pair of first electrodes, and a signal source that emits an alternating current signal; and a step-up transformer that applies a stepped-up voltage to the pair of first electrodes. The power receiving device has a pair of second electrodes opposite to and that capacitively couple with the first electrodes; a step-down transformer; a rectifying and smoothing circuit that rectifies and smoothes the stepped-down AC voltage; and a load circuit, The charging station further has a potential stabilizing electrode that capacitively couples with the electrode connected to a reference potential of the power receiving device and the potential stabilizing electrode is connected to a reference potential of the charging station via a charge controller.