GROMMET AND WIRE HARNESS

A grommet (1) includes: a water stop portion (13) that has an annular shape and is inserted to a through hole (101) formed in an attachment panel (100) for stopping water; and a first partition wall portion and a second partition wall portion that are unit arranged to project toward a radially inner side of the water stop portion (13)water stop portion. The water stop portion (13) includes: a first contact portion (131) that is capable of coming into contact with a first side surface (101a) of a circumference edge portion of the through hole (101); a second contact portion (132) that is capable of coming into contact with the first side surface (101a); a groove portion (133) formed in an annular shape between the first contact portion (131) and the second contact portion (132); and a recess/protrusion portion (135) that is formed on a circumferential wall inside the groove portion (133).