BIDING HOLE DISTINGUISHING STRUCTURE

摘要

PROBLEM TO BE SOLVED: To provide a binding hole distinguishing structure which prevents a position for receiving a binding ring to be inserted from being deviated while emphasizing the position of a second binding hole without changing the difference in diameter between a first binding hole and the second binding hole. SOLUTION: The first binding hole 13 and the second binding hole 14 are formed along the binding side edge 11 of a clear pocket 10. The second binding hole 14 is diametrally larger than the first binding hole 13. A zonal part 15 is provided for these binding holes 13, 14 and is set to be smaller than the diameter of the second binding hole 14. A part of the second binding hole 14 protrudes from the edge of the zonal part 15 and thus the second binding hole 14 and the first binding hole 13 are distinguished from each other.