CONTACTLESS ELECTRICAL POWER TRANSMISSION DEVICE, AND ELECTRICITY SUPPLY DEVICE AND ELECTRICITY RECEPTION DEVICE USING SAME

A power feeder (15) of a contactless power transmission device (14) includes a housing base member (35), a primary coil (40) provided on the housing base member (35) and configured to generate magnetic flux, a cover (36) attached to the housing base member (35) and configured to cover the primary coil (40), a capacitance sensor (21) including a detection electrode (E2) between the primary coil (40) and the cover (36), and configured to detect foreign matter (30) around the cover (36) based on a change in capacitance detected using the detection electrodes (E2), and a high-dielectric member (37) embedded in the cover (36) and having a permittivity higher than that of a material for the cover (36).