To provide a device that performs fastening cancel of a screw member with little labor even in a case where a loosening prevention effect is large, and can add axial force to a fastening member with small torsional stress.

A screw pitch P(Z) of a washer 1 constituted by screwing and combining a male screw washer 2 and a female screw washer 3, or a nut 5 and a bolt 4 screwed and combined with the female screw washer 3 is different from a screw pitch P(N) of a bolt 6 and a nut 7 for fastening.