To provide a packaging box that makes it possible to easily assemble a bottom plate when assembling the box from its folded state into a box shape.SOLUTION: In a packaging box 1, a bottom plate 10 is provided with a first flap 21 and a second flap 22. The first flap 21 has a folded portion 24 connected to a flap body 23 via a first fold line L11. The folded portion 24 has a first sloping edge 21d along the lower edge of a first sloping wall 14. The second flap 22 has a joint 26 connected to a non-joining portion 25 via a second fold line L12. The joint 26 is joined to the folded portion 24. An angle between the lower edge of a first wall plate 11 and the first fold line L11 is set at ? degrees, and an angle between the first fold line...

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