| 摘要 |
A cylindrical hollow section 121 communicates with openings at both ends, and an outer casing 21 is inserted therethrough. A circumferential groove 123 is formed around the axis on the inner circumferential wall of the cylindrical hollow section 121. An injection hole 124 communicates with the outside and the circumferential groove 123, and allows an adhesive to be injected into the circumferential groove 123. A portion of the circumferential groove 123 is removed to form an air flow channel 125 that communicates with the outside and enables air to move between the circumferential groove 123 and the outside when the outer casing 21 is inserted through the cylindrical hollow section 121. As a result of this configuration, a grommet can be provided that enables the adhesive to be spread sufficiently by means of a simple operation even when the outer casing is brought into close contact with and inserted through the grommet. |
