A grommet that can be easily attached to a panel. The grommet (1) allows a wire harness to pass through it and is attached to a hole (10a) in the panel (10). The grommet (1) includes a tubular body section (2) having formed in its entire periphery an engagement groove (3) engaging the hole (10a). On the outer surface of the body section (2) are arranged a set of two first ribs (8) and a set of twosecond ribs (7) that extend from one end side to the other end side of the body section (2) and are spaced from each other. The first ribs (8) are located on one side of an imaginary plane includinga center axis (P) and a long dashed double-dotted line (Q). The second ribs (7) are arranged on the other side of the imaginary plane. The width of a first rib (8) is greater than the width of a second rib (7).