PURPOSE: To prevent destruction of a driving layer by furnishing an outer cylinder having a hole at the bottom, a crest in a body or separate piece at the bottom of the outer cylinder, a shaft to be inserted from the top of the outer cylinder, a rod- shaped anchor member whose bottom confronts a hole in the outer cylinder, a spacer capable of being removed, and an adhesive put in a capsule.

CONSTITUTION: A rod-shaped anchor member 4 is interposed between a shaft 2 and a crest part 1d formed bending in a single piece or provided separately and fixed, wherein the bottom of the anchor member 4 confronts a hole 1c provided in an outer cylinder 1. When the head 2b of the shaft 2 is driven by hammer, the outer cylinder 1 and shaft 2 are consolidated by a spacer 6 which is capable of being removed, and the outer cylinder 1 is driven till a flange 1b. With another strike, movement is stopped owing to the flange 1b and compressed by the head of the shaft 2, and the spacer cylinder 6 is split and segregated. With a subsequent strike, attachment of adhesive 3 is released, and the shaft head 2b is driven to the surface of the flange 1b. At this time, the anchor member 4 emerges out of the hole 1c and intrudes into the underlay layer B without destruction of the layer, and thus anchor is achieved. A capsule 7 is destructed, and adhesive secures outer cylinder 1, shaft 2, and anchor member 4 together.