an annular mounting portion fixed to a surrounding portion of an insertion hole of an object to which the grommet is attached and which includes the insertion hole;

a tubular stress-absorbing portion including a tubular side wall that extends from an inner circumferential rim portion of the mounting portion toward one side in an axial direction of the mounting portion, and a bottom wall that partially closes off the tubular side wall at a front end of the tubular side wall; and

a tubular insertion portion provided integrally with the bottom wall of the tubular stress-absorbing portion, and configured to come into contact with an outer circumferential surface of a wire harness inserted into the insertion hole of the object and cover an outer circumference of the wire harness,

wherein the mounting portion includes an annular seal portion that comes into close contact with the surrounding portion of the insertion hole of the object to which the grommet is attached, or with an inner circumferential surface of the insertion hole,

the side wall is flexible, and

the insertion portion protrudes inside the stress-absorbing portion from the bottom wall toward a side of a base end of the side wall such that the side wall covers the insertion portion in its entirety.