Patent ID: 7194787

Claim:
A sheet attaching instrument, comprising: an instrument body that is attached to a sheet; and an attachment member that is arranged on the sheet and engaged with the instrument body by being moved relative to the instrument body, wherein either one of the instrument body and the attachment member has a plurality of attachment projections that penetrate the sheet, and enlarging sections that are respectively enlarged from the attachment projections; the other one of the instrument body and the attachment member has a plurality of engaging holes that engage with the respective attachment projections, the engaging holes each having an inserting section into which the enlarging section can be inserted, and a holding section that continuously extends to the inserting section and can hold the enlarging section when the enlarging section steps on the holding section; and at least one of the engaging holes has a bridge on at least one peripheral edge of a pair of lateral side areas extending from the inserting section to the holding section, the bridge having opposite ends and being fixed to the at least one peripheral edge only at the opposite ends, the bridge having a middle section spaced away from the at least one peripheral edge by a slit extending continuously between the opposite ends of the bridge and being elastically deformable in a direction to be away from the at least one of the engaging holes, and a fall-stop on the middle section that protrudes toward the inside of the at least one of the engaging holes to hold the attachment projection.