To solve the problem that the manufacturing cost of a conventional fitting formed by welding a bolt and a nut to a washer formed with spikes is expensive and that a use of the bolt and the nut is limited.

A washer 1 formed with a bolt insertion hole 3 is formed with three turn stopper claws 7 by cutting and standing them, and formed with spikes 5 projected backward. A distance from the turn stopper claws 7 to the center of the bolt insertion hole 3 is a little larger than a half of a double- surface width B of a bolt head 13 and a nut 17. When seating the bolt head 13, for example, in a front surface 1a of this washer 1, the turn stopper claws 7 come close to a flat side surface 13a or lightly brought in contact with the side wall surface 13a. The spikes 5 work as a turn stopper for the washer 1 itself, and the turn stopper claws 7 of the washer 1 work as a turn stopper for a bolt 11. Since this washer 1 is not integrally formed with a bolt and a nut, manufacturing cost is suppressed, and a use of a bolt and a nut is not limited.