| 摘要 |
A surface (20C) of a lid portion (20) of a hole plug (10) has formed therein at least a circular first groove portion (54). The first groove portion (54) is formed outside of where the lid portion (20) is connected to a base portion (24) extending from the rear surface of the lid portion (20), the first groove portion (54) being formed in a circle with a smaller diameter than a through hole. Thus, when the lid portion (20) is pressed towards the through hole in the direction of insertion and warps, the first groove portion (54) serves as the origin of this warping, and a central portion (20A) of the lid portion (20) is pressed into the through hole and caused to elastically deform until the central portion (20A) is inverted. |
