WATER STOP STRUCTURE FOR WIRE HARNESS AND METHOD OF FORMING WATER STOP SECTION

It is prevented for water to penetrate through a connecting portion of a connector at an end of a wire harness and an electronic control unit to the electronic control unit from a wire side. The present invention relates to a water stop structure for a wire harness connected to an electronic control unit installed in an automotive vehicle or a motorcycle. Terminals mounted on ends of wires constituting the wire harness are inserted and locked for connection in a unit connecting connector to be mated with a connector of the electronic control unit, each wire connected to the unit connecting connector includes a water stop section at a position very close to the connector, and the water stop section is formed by filling a waterproofing agent into clearances between strands of a core exposed part formed by removing an insulation coating covering the core of each wire and coating the core exposed part with a waterproof member.