A curvature-restraining member and a power feeding device include a wire harness having an electric wire and a corrugated tube (flexible tube). The curvature-restraining member restrains the wire harness from curving in a predetermined curving direction D3 with a radius of curvature smaller than a reference radius. The curvature restraining member includes a body portion placed near at least one of ends of the corrugated tube and extending in a length direction of the electric wire, and a curved portion extending from one end of the corrugated tube opposite from the former end, and curving in the curving direction D3 with a radius of curvature not less than the reference radius with such a length that it falls within the straightly extending corrugated tube.