To provide an anti-slip seat for a fastening member capable of preventing displacement or slip of a fastened member when fastening and fixing a plurality of fastened members.

The anti-slip seat for a fastening member includes anti-slip fine particles. Accordingly, frictional coefficient is increased by holding it between the fastened members to efficiently prevent loosening of a bolt due to vibration and displacement between the fastened members due to external force in a rotation direction and/or a parallel direction, and the fastened members are reliably fixed.