To employ one kind of a metal collar to each of a plurality of kinds of bolt insertion hole parts, and to absorb positional displacement caused by tolerance of forming stages of an attachment mating member and a synthetic resin component.

This fastening seat-face pitch absorption bracket 10 comprises: a fixed part 20 at which the bolt insertion hole parts 22 are formed; the cylindrical metal collar 32; and a collar support member 42. The collar support member 42 has: a core 44 which has a penetration part 45 having the metal collar 32 and movably arranged inside the bolt insertion hole parts 22 in a direction orthogonal to penetration directions of the bolt insertion hole parts 22; and a pair of retaining parts 47 which are hung to the external peripheral side from the extremely periphery of the core 44 and positioned while sandwiching at least one portion of opening edges of the bolt insertion hole parts in the penetration directions of the bolt insertion hole parts 22.