To provide a packaging box whose surface sealed with an adhesive can be easily opened.SOLUTION: A packaging box 1 has at least one wall part formed of a pair of inner flaps 18 and 18 and a pair of outer flaps 17 and 17. In the pair of outer flaps 17 and 17, tip edges 17a and 17a are abutted to each other. In both of the tip edges 17a and 17a, each finger insertion part 19 is formed. In the pair of outer flaps 17 and 17, break induction lines 20 for opening are formed astride the pair of outer flaps 17 and 17. The break induction lines 20 for opening cross both of the finger insertion parts 19 and 19 and extend along both tip edges 18a and 18a of the pair of inner flaps 18 and 18.SELECTED DRAWING: Figure 1

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