| 摘要 |
PROBLEM TO BE SOLVED: To provide a collapsible container wherein unstable deformation can be prevented from occurring to its flap boards when load is applied from above and sufficient strength can be developed constantly while variation in degree of strength liable to occur to container being minimized. SOLUTION: In order to make each of the flap boards 28 bulge toward the outside whenever a load is applied to the flap board 28 from above, a weak part being weakened at a part facing the inside of the container is provided at the flap board itself or plate-like ribs 33 provided at the flap board.
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