| CPC B65D 5/6602 (2013.01) [B65D 5/6652 (2013.01)] | 11 Claims |

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1. A packing box formed of a corrugated board paper, for packing an object to be packed, said packing box comprising:
a box body capable of accommodating said object to be packed and provided with an opening at a side portion thereof;
an inner lid portion provided so as to close at least a part of said opening; and
an outer lid portion folded at a folding portion so as to overlap with at least a part of an outer surface facing an outside of said inner lid portion, wherein when a surface of said outer lid portion opposing to said inner lid portion is a rear surface and a surface opposite to said rear surface is a front surface, said rear surface is provided with:
an adhesive portion adhered to said outer surface of said inner lid portion,
a first slit cut from said rear surface and not reaching up to said front surface, said first slit being provided so as to surround said adhesive portion together with said folding portion, the first slit including a portion which is not overlapped with the adhesive portion, and
a second slit cut from said rear surface and not reaching up to said front surface, said second slit being cut so as to extend between an outer edge of said outer lid portion and said first slit from said outer edge toward said first slit.
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