A protector with a sensor couples to a sliding door. A first end of an insert made of a non-conductive material is inserted in and fills up a space on a hollow part of the protector, and a terminal part is into die molding. The insert includes at least two feeding ports to receive and feed molding material into the insert during die molding. The feeding ports are spaced from each other and formed along a direction in which a wire harness extends. Covered parts are exposed from the wire harness where the covered parts are faced with the feeding ports.