| 摘要 |
PROBLEM TO BE SOLVED: To provide a packing box from which a product stored inside is easily taken out, and whose strength against pressing force in a vertical direction is made higher.SOLUTION: In reinforcing plates parts 13a to 13d, corrugations of a corrugated board sheet extend in a Z direction. Since strength against the pressing force applied in the Z direction is added by an amount equivalent to the reinforcing plate parts 13a to 13d, the strength, which is low, against the pressing force in the Z direction of second side surface parts 16a and 16b can be compensated. |
