A grommet has an engagement tube with an elliptical cross-section and is provided continuous with and bent from a leading end of a narrow tube through which the wire harness passes while coming into close contact therewith. An annular vehicle body engagement recess is provided in an outer circumferential surface of the engagement tube. Arc-side reinforcements protrude radially inward at connecting positions between a circumferential wall of the narrow tube and arc-shaped circumferential walls of the engagement tube that face each other in a major axis direction. The thickness of the arc-side reinforcements is greater than the thickness of connecting positions between the circumferential wall of the narrow tube and respective linear circumferential walls that face each other in a minor axis direction.