GROMMET

To prevent an occurrence of buckling of a grommet such as a door grommet that is related to an opening/closing operation. A grommet formed of rubber or elastomer and externally fitted onto a wire harness extending between a vehicle-body panel and an opening and closing body comprised of a door or a trunk lid of a vehicle, the grommet includes: a pleated cylindrical section 2; a curved cylindrical section 3, 4 extending from an end of the pleated cylindrical section; and a large-diameter cylindrical section 5, 6 arranged at a tip end of the curved cylindrical section, wherein: a vehicle-body engagement recess 7, 8 is formed on the outer circumference surface of the large-diameter cylindrical section, or an inner resin member formed with vehicle-body engagement pawls is internally fitted into the large-diameter cylindrical section; and at least one of the outer circumference surface and the inner circumference surface of the curved cylindrical section 3, 4 is provided with reinforcement ribs 10 for resisting buckling.