GROMMET AND WIRE HARNESS

A grommet includes a fitting body (10) causing a circumferential edge portion of a through hole (Pw1) provided in a wall body (Pw) to be fitted into a fitting groove (13) provided in an outer wall (12), and a first cylinder (20A) and a second cylinder (20B) causing a harness body (We) to be extracted through the cylinder. The fitting body (10) includes a cylindrical portion (12A), a plurality of ribs (15) rising from an outer circumferential wall surface (12a) of the cylindrical portion (12A) and disposed on the outer circumferential wall surface at equal intervals in a circumferential direction, and a first support portion (16A) and a second support portion (16B) provided for each of the ribs (15). The first support portion (16A) and the second support portion (16B) project from the outer circumferential wall surface (12a) to be high enough to suppress elastic deformation of the rib (15) in the circumferential direction toward the outer circumferential wall surface (12a) .