GROMMET

To provide a grommet which can achieve both sealing performance of a cylindrical part and workability of insertion work of an electric wire into the cylindrical part.SOLUTION: A grommet 1 comprises: a cylindrical part 30; and a body part 10 from which the cylindrical part 30 extends. The cylindrical part 30 has a recessed strip groove 31 which is formed by a cylinder wall of the cylindrical part 30 narrowed to be recessed to the inside in the radial direction. The recessed strip groove 31 has: a small diameter part 34 which constitutes a groove bottom of the recessed strip groove 31; and a tip end-side groove wall part 36 which extends from the small diameter part 34 to the tip end side of the cylindrical part 30, and which has a shape whose inner cylindrical diameter becomes larger as it is away from the small diameter part 34. The cylindrical part 30 has a large diameter part 32 which is located on the base end side of the small diameter part 34, and which has an inner cylindrical diameter larger than that of the small diameter part 34. The recessed strip groove 31 has a base end-side groove wall part 35 which extends from the small diameter part 34 to the base end side of the cylindrical part 30 so as to connect the small diameter part 34 to the large diameter part 32. The cylinder wall at a connection portion Q between the large diameter part 32 and the base end-side groove wall part 35 is thinner than the cylinder wall on the periphery of the connection portion Q.SELECTED DRAWING: Figure 4 【課題】筒状部における封止性能と、筒状部へ電線を挿通する作業の作業性と、を両立可能なグロメットを提供すること。【解決手段】グロメット１は、筒状部３０と、筒状部３０が延出する本体部１０と、を備える。筒状部３０は、筒状部３０の筒壁が径方向内側に窪むように窄まった凹条溝３１を有する。凹条溝３１は、凹条溝３１の溝底を構成する小径部３４と、小径部３４から筒状部３０の先端側に向けて延びるとともに小径部３４から離れるにつれて筒内径が大きくなる形状を有する先端側溝壁部３６と、を有する。筒状部３０は、小径部３４の基端側に位置するとともに小径部３４よりも筒内径が大きい大径部３２を有し、凹条溝３１は、小径部３４から筒状部３０の基端側に延びて小径部３４と大径部３２とを繋ぐ基端側溝壁部３５を有する。大径部３２と基端側溝壁部３５との接続箇所Ｑにおける筒壁の厚さは、接続箇所Ｑの周辺における筒壁の厚さよりも薄い。【選択図】図４