Patent ID: 7451519

Claim:
A sheet holding structure comprising: a base material made of a flexible material and having main surfaces; and a slit formed in the main surfaces of said base material, wherein said slit includes: a curved slit; and a plurality of protruding slits spaced from each other in a direction along said curved slit, connected to a protruding portion-side forming edge of said curved slit, and protruding and extending from the protruding portion-side forming edge of said curved slit to form a plurality of trapezoidal locking portions separated by the plurality of protruding slits, wherein a part of said base material surrounded by said curved slit is bendable so that a part of a sheet placed on one of the main surfaces of said base material may be inserted into said curved slit and said protruding slits and locked to thereby hold the sheet, and a plurality of protruding edge portions having substantially triangular apexes protruding toward the protruding portion-side forming edge are formed at a recessed portion-side forming edge of said curved slit, the respective apexes protruding to extend in directions in which said plurality of protruding slits protrude.