A resonant power-transfer device provided with a power element that performs high-frequency switching operations at a frequency of 2 MHz or higher. Said resonant power-transfer device is provided with the following: a resonant circuit element comprising a capacitor and a coil that apply resonant switching to the switching operations performed by the aforementioned power element; and a resonant transmission antenna (1) that transfers power outputted via the switching operations performed by the power element. The coil in the resonant circuit element also serves as the resonant transmission antenna (1).
