| 摘要 |
PROBLEM TO BE SOLVED: To easily put toys for children in order after playing with them. SOLUTION: A region 15 is folded as a bottom section, and regions 12, 14, 16 and 18 are folded as side surfaces. At the same time, regions 11, 13, 17 and 19 are folded at the diagonal lines, and are superposed on respective side surfaces. In this case, hook-and-loop fasteners 45 and 43 are engaged, and a male hook-and-loop fastener 21 is engaged with a female hook-and-loop fastener 47. In addition, hook-and-loop fasteners 31 and 41 are engaged. A triangular piece which is constituted of the regions 13 and 19 is superposed in the same manner as well. Thus, this sheet member can be built up into a box-shape of which the upper section is open. Therefore, toys are collected on the building up sheet 1, and by simply building up the building up sheet 1, the toys can be housed in the box-shape.
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