| 摘要 |
PROBLEM TO BE SOLVED: To provide a corrugated fiberboard case wherein a load working from vertically upward is not transferred to a housed container even when inner flaps are bent inward due to the load. SOLUTION: The corrugated fiberboard case 1 having four sides of an upper surface opening surrounded by two side flaps 4, 4 and two main flaps 5, 5 is formed with a semi-cut line 8 or perforations in parallel to a crease 7 on at least one of the side flaps 4, 4, wherein the line 8 is located between the crease 1 serving as a border from a side face and a tip of the flap.
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