A protector with a sensor is installed on a sliding door for detecting an object by touch between two core wires in a hollow part. In a terminal part of the protector with the sensor, the core wires drawn out are connected with leads joined with a control unit. A primary seal is formed by means of injection moulding for covering wire connection parts and another end side of an insert while also covering a skin of a wire harness which ties and coats the two leads. A secondary seal is formed by means of the injection molding for coating a part formed with the primary seal and for forming an external shape of a prod uct.