| 摘要 |
<p>PROBLEM TO BE SOLVED: To solve the problem that a cost or the like for increasing thickness of a cardboard as material and for making complicated folding is needed in order to increase strength of a cardboard box having an opening and closing function.SOLUTION: A flap leading from a side face of a cardboard box is formed in a triangular shape, and weight subjected to a top cover is received by the flap, thereby a cardboard made box where strength of the cardboard box is increased and the cardboard box is hard to deform is obtained.</p> |
