| 摘要 |
PROBLEM TO BE SOLVED: To provide a packaging box that includes a child lock mechanism free from the need of a special assembly process and a special assembly structure, and a complicated operation in opening/closing work, and allowing opening/closing a lid many times, and a development sheet for the same.SOLUTION: A packaging box is such that: a side part includes right and left side surfaces, and front and rear side surfaces; a lid part includes an upper sealing surface extending from the upper end edge of the rear side surface, and an upper insertion piece to be inserted into the reverse side of the front side surface; the front side surface includes an opening operation part surrounded by the upper end edge and a notch line, and a tongue part surrounded by a notch line having an upward protruding shape, and sandwiching the upper insertion piece to be inserted in re-sealing after opening by the front side surface; and the upper insertion piece includes an engaging piece positioned by being surrounded by a notch line having a protruding shape toward the upper sealing surface, and to be engaged with the upper edge of an opening generated by separation of the tongue part. |
