A non-contact power transmission device (1), comprising a washbasin (10) including a primary coil (20), and an electric toothbrush (50) including a secondary coil (53). A central door (12) includes a third relay coil (23) that relays the flow of magnetic flux from the primary coil (20) to the secondary coil (53). The position of the third relay coil (23) relative to the primary coil (20) changes as a result of the opening and closing of the central door (12).
