PURPOSE: To facilitate the fixing of an attached body having large movement quantity by, after the external thread part of a bolt is turned in the attached body, providing it with a through internal thread part through which the neck part of the bolt passes, forming a slot part through which the neck part of the bolt can pass on the above internal thread part in succession to the above internal thread part, and providing a fixing internal thread part which the above external thread part threadedly engages on the attached body.

CONSTITUTION: A bolt 1 is composed of an external thread part 1a formed at one end, a neck part 1b having a diameter somewhat smaller than that of the thread part 1a, and a head part 1c formed at the other end. After the external thread part 1a is screwed into an attached body 8, which is provided with a through internal thread part 3 through which the neck part 1b of the bolt 1 can pass, and a slot part 6 through which the above neck part 1b can pass is formed in succession to the internal thread part 3. The bolt 1 is first screwed into the internal thread part 3 as shown by an arrow 5 for assembling them, and then moved along the slot part 6, and brought into line with the fixing internal thread part 7 of an attached body 4 for fixing them. Thus, even when the attaching position of the attached body 4 shifts, the bolt 1 can easily cope with the above positional shift because of its large movement quantity.