Waterproof plug structure

摘要

A wire insertion hole is formed through a rubber plug along an axis thereof, and the rubber plug has a portion having outer seal lips formed on an outer peripheral surface thereof, and a fixing region to which a metal terminal is clamped. The fixing region includes a clamping region to be clamped by an insulation barrel of the metal terminal, and a withdrawal prevention region. An annular groove is formed in the inner surface of the wire insertion hole at a position corresponding to a boundary portion between the clamping region and the withdrawal prevention region. When the insulation barrel is clamped, the withdrawal prevention region is forcibly flared to be engaged with the metal terminal, thereby preventing the rubber plug from being withdrawn.