Patent ID: 7868256

Claim:
A grommet, made of an elastic body, which is externally mounted on a group of electric wires to be spanned between a car-body panel and a movable body consisting of a door or a trunk lid coupled to said car-body panel through a hinge member, said grommet comprising large-diameter cylindrical parts which are disposed on one and other ends thereof in a longitudinal direction thereof and have an annular locking groove respectively to be inserted into and locked to a through-hole formed through said car-body panel and a through-hole formed through said trunk lid respectively; small-diameter cylindrical parts continuous with said large-diameter cylindrical parts respectively; and a bellows-like cylindrical part provided between said small-diameter cylindrical parts with said bellows-like cylindrical part continuous with said small-diameter cylindrical parts, wherein said bellows-like cylindrical part is bent in a shape of U, when said movable body is closed; and said bellows-like cylindrical part has large-diameter mountain portions and small-diameter valley portions formed over a whole length thereof at regular intervals with said mountain portions continuous and alternating with said valley portions; and in a state in which said bellows-like cylindrical part is bent in said shape of U, a thickness of a thick region including an apex of a bent portion therein is set larger than that of other region so that a curvature of said bent portion is large.