To reduce labor and time in putting a sheet material such as a face cover inside a packaging box, and also place the sheet material when in use without a large space required.
A packaging box 10 formed as a parallelopiped for receiving the sheet material S inside has a top plate 11 and a bottom plate 12 having a larger area than that of the sheet material S, and side plates 13 provided between rims of the top plate 11 and rims of the bottom plate 12. A cut 16 is formed on each of diagonally located connecting plates 15 among the side plates 13 to connect the upper end part and the lower end part at the approximately center position in the lateral direction of each connecting plate 15. Perforations 17 are formed approximately at the center in the lateral direction of the top plate 11 to connect the upper ends of the cuts 16 to each other, so that the perforations 17 are torn open and the box can be two-folded while opening the torn part.
Takao Ito
Jiro Higuchi
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