Abstract: Leading end sides of a plurality of wires to be electrically connected with each other are respectively inserted through a plurality of through holes formed in a waterproof rubber lid and the outer circumferential surfaces of insulating coatings of the respective wires are held in close contact with the inner circumferential surfaces of the respective through holes for sealing. The insulating coatings are peeled off at the passed-through ends of the wires to expose cores. The exposed cores are welded, fusion-bonded, soldered or fastened by a crimping terminal to form a terminal joint section. The terminal joint section is inserted into a protection cap made of a bottomed resin molding through an opening end. The waterproof rubber lid is fitted to an opening end of the protection cap to seal the interior of the protection cap accommodating the terminal joint section without injecting a waterproofing agent into the protection cap.

Abstract: Leading end sides of a plurality of wires to be electrically connected with each other are respectively inserted through a plurality of through holes formed in a waterproof rubber lid and the outer circumferential surfaces of insulating coatings of the respective wires are held in close contact with the inner circumferential surfaces of the respective through holes for sealing. The insulating coatings are peeled off at the passed-through ends of the wires to expose cores. The exposed cores are welded, fusion-bonded, soldered or fastened by a crimping terminal to form a terminal joint section. The terminal joint section is inserted into a protection cap made of a bottomed resin molding through an opening end. The waterproof rubber lid is fitted to an opening end of the protection cap to seal the interior of the protection cap accommodating the terminal joint section without injecting a waterproofing agent into the protection cap.