| 摘要 |
PROBLEM TO BE SOLVED: To provide a fastening member which does not require a specified tool and a particular operation and, even when a screw hole is enlarged temporarily by a typhoon or the like, can be prevented from coming out from roof material or the like.SOLUTION: A fastening member 1 includes: a screw shank 2 which is formed of a thread 21 on an outer circumferential surface; and a screw head part 3 which is disposed on the rear edge of the screw shank 2. Therein, an expanding piece 4 which is split so as to go along the shank line from a predetermined position in the longitudinal direction of the screw shank 2 toward the tip direction, is provided with an elastic force and is expanded in the radial direction. |
