GROMMET

A grommet includes: an enlarged-diameter cylindrical portion that has a fitted groove that is around a larger-diameter-side peripheral portion and is configured to be fitted to a through hole of a panel, and an elastically deformable portion that extends from the larger-diameter-side peripheral portion to a smaller-diameter-side peripheral portion and is elastically deformable; and a smaller-diameter cylindrical portion that is configured to be connected with the smaller-diameter-side peripheral portion of the enlarged-diameter cylindrical portion, and in which a wire harness is inserted. A reinforcement rib protrudes from an interior surface of the elastically deformable portion of the enlarged-diameter cylindrical portion. The reinforcement rib is T-shaped. The reinforcement rib has depressions for deformation. The depressions for deformation face in the opposite directions. An intersection of the reinforcement rib that is T-shaped is between the depressions for deformation.