To obviate a prepared hole, directly drive a fixture into a material at one process, and provide with a firm pull-out prevention effect by inserting a shaft into a hole of an outer cylinder provided with a slit from the tip point part to the end flange side and driving it into the material to be fixed.

An outer cylinder 1 is provided with a point part 1a in its tip, a flange 1b in its end, a bottomed hole 1c extending from the end to its intermediate part, and a narrow tapered face in the tip side of the hole bottom 1d. A slit 1e is provided in such a state as penetrating through the center of the hole bottom 1d to the tip. When a shaft 2 is inserted in the bottomed hole and driven in this state, the shaft 2 is made to stop by the outer cylinder hole bottom 1d, till the outer flange 1b reaches a material to be fixed, so that the outer cylinder 1 is entered into the material to be fixed without being opened at its slit 1e part. When the flange part 1b reaches the material to be fixed, the entering of the outer cylinder 1 is stopped, the outer cylinder 1 is opened at the slit 1e part by contact component force between the outer cylinder hole bottom 1d and the bottom end of the shaft 2, and the shaft 2 is driven into the outer cylinder 1. The opened part of the outer cylinder 1 thus works as an anchor resisting to the pull-out force.