GROMMET AND METHOD OF INSTALLING THEREOF

A grommet (10) according to an embodiment of the present invention includes a wire harness connecting part (11) which is liquid-tightly connected to a wire harness (20), a panel connecting part (13) which can be liquid-tightly connected to a panel opening (31), an extending part (12) shape-changeably extending between the wire harness connecting part (11) and the panel connecting part (13), and an extending-part-shape maintaining part (12a) which maintains a shape of the extending part (12) in a state where a distance between the wire harness connecting part (11) and the panel connecting part (13) in a length direction of the wire harness (20) is shorter than that of the case where the panel connecting part (13) is liquid-tightly connected to the panel opening (31).