| 摘要 |
PROBLEM TO BE SOLVED: To provide a packing box capable of enhancing the support strength of a lock type bottom wall.SOLUTION: A packing box 10 is such that a bottom wall 21 is formed by overlapping a pair of outer flaps 50 on the outside of a pair of inner flaps 30 butted with each other. The outer flap 50 has a pair of insertion pieces 51 separated from each other, sandwiching a butted part 30a of the pair of inner flaps 30, and a reinforcement part 56 formed between the pair of insertion pieces 51 and swelling in a circular arc shape from the base end of one insertion piece 51 to the base end of the other insertion piece 51. The inner flap 30 has a push-in part 31 which opens by pushing in so as to insert the insertion piece 51 into. The tip position α of the circular arc edge 57 of the reinforcement part 56 is set on the base end side of the insertion piece 51 than the tip position &bgr; of the insertion piece 51. |
