A power feeding coil unit includes a power feeding coil, and first and second auxiliary coils arranged so that a wire of the first auxiliary coil and a wire of the second auxiliary coil do not overlap a wire of the a power feeding coil when viewed from a direction perpendicular to an axial direction of the power feeding coil. A direction of circulation of a magnetic flux generated by the first auxiliary coil and a magnetic flux generated by the second auxiliary coil are opposite to a direction of circulation of a magnetic flux generated by the power feeding coil. An axes of the first and second auxiliary coils are substantially perpendicular to a power feeding direction of the power feeding coil, and are not aligned with the axis of the power feeding coil.