PACKAGING BOX

PROBLEM TO BE SOLVED: To provide an inexpensive packaging box of an extremely simple structure, allowing for an easy discernment, from outward appearance, of its having been once opened even when the box has once been opened with a fingertip being inserted into a gap between itself and an upper lid while the upper lid has been re-closed thereafter, the box requiring no sealing either, and even if it is opened with an unintended method, it is possible to visibly recognize, from its outward appearance, its having once been opened.SOLUTION: The packaging box as means of solution to the problem, including: a bottomed square cylindrical box body, having an openable and closable lid plate with one upper end side of the box as a base end; an insertion piece provided at the free-end part of the lid plate; a pressing portion for opening, enclosed by a line of perforation with its shape opened upward, at the upper end part of a back plate abutting on the insertion piece of the lid plate; and a fixed part wherein the inside surface of the pressing portion for opening and the insertion piece are fastened. In this packaging box, V-shaped notches opened toward the upper edge are formed at both ends of the line of perforation with its shape opened to upper side, while the fixed part includes right and left side edge parts on the inside surface of the pressing portion for opening.