A grommet includes two semicircular closing plate sections that protrude from inner peripheries of a larger diameter end of an enlarging diameter tubular section provided with a vehicle body latch recess. Two half ring sections protrude from peripheral edges of central circular cut-outs at opposed ends of the semicircular closing plate sections. Adhesive tape is wound around the half ring sections. The semicircular closing plate sections are thinner than the enlarging diameter tubular section and have bellows-like configurations with projections and depressions. The half ring sections deform in accordance with an outer diameter of the wire harness and a bending direction of the wire harness. Deformation of the semicircular closing plate sections is absorbed by the bellows-like configurations, and the vehicle body latch recess of the enlarging diameter tubular section coupled to an outer periphery of the semicircular closing plate sections.