Grommet

A grommet (10) is provided with a circular channel (15) around its outer surface serving to hold a car's body panel (2), thereby forming a circular channel base (15a) and first and second channel walls (15b, 15c) extending outwardly therefrom. The circular channel (15) also forms corresponding first and second circular edges (20, 21) at respective outermost portions of the first and second channel walls (15b, 15c). Further, the first circular edge (20) extends more outwardly than the second circular edge (21) in a diametrical direction of the grommet (10), and has a flat edge (20a) in the same direction so as to hold the car's body panel (2). The first and second walls (15b, 15c) are brought closer as they rise from the channel base (15a), such that the first circular edge (20) laps over the second circular edge (21) in a longitudinal direction of the grommet (10). Further, the portion of first channel wall (15b) facing the second circular edge (21) is grooved so as to form a circular groove (22) along the second circular edge (21) and opened towards the channel (15), whereby the minimum distance between the first and second channel walls (15b, 15c) can be set to be above a predetermined value. When the outwardly narrowing channel in the grommet (10) has such a configuration, the dies used for molding such a grommet (10) can be made highly durable.