To provide a pointed bolt for attaching a tight frame capable of reducing a member cost, the improvement of working efficiency and the shorting a construction period by refreshing a folded plate roof into a new folded plate roof very simply, surely and quickly.

One end side is provided with a female screw part 2 capable of being screwed on a bolt 7 erected on the top part 6a of a tight frame 6, and a pointed bolt body 1a having a male screw part 3 having a pointed part 3a on the other end side integrally provides the receiving part 4 of a folded plate roof for reform punched through the pointed part 3a of the male screw part 3, and a tool contact part 5 capable of firmly tightening the pointed bolt body 1a screwed to a bolt 7 through a tightening tool.