Grommet

A grommet has a plurality of projecting strip portions provided on an outer peripheral surface of a tapered portion, extending in an axial direction of the tapered portion and being spaced from each other in a circumferential direction. The grommet also includes at least one sunken portion, which defines the outer peripheral surface of the tapered portion between adjacent projecting strip portions. The sunken portion includes a groove extending in an axial direction of the grommet.