To accommodate a connector in a grommet for inserting an option electric wire.

This grommet is attached to a wire harness being inserted into a drilled hole which is drilled in a body panel of a vehicle, and comprises a grommet body constituted of an elastic material provided with a connector storing part for storing a connector connected to the front end of a bundle of electric wires of the wire harness on the front end of an electric-wire inserting cylindrical part, into which the wire harness is inserted and a resin- made inner sleeve for locking a connector by fitting it thereinto and fitting the connector in the connector storing part. A cover part is formed in a protruding manner from a part of the peripheral wall of the inner sleeve via a thin hinge, and an inserting space for the option electric wire is formed with the cover part covering the peripheral wall.