To screw a bolt in a hole of an object to be fastened by using a fastening tool so as to fix the bolt to the object to be fastened.

The bolt 1 is provided with a projection part 7 projected from an inclined face 6b of a ridge 6 at a terminal portion 6a on a head part 8 side of the ridge 6 of a shaft part 5. The bolt of this constitution is screwed in a female screw 3b formed in the hole of the object 3 to be fastened, the projection part 7 disposed to the terminal portion 6a of the ridge 6 is seized and fixed (friction-welded) to a screw groove of the female screw 3b. Therefore, the bolt 1 is fixed to the object 3 to be fastened in such a state that the shaft part 5 is inserted into the hole formed in the object 3 to be fastened.

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