To provide a packaging box that can suppress the lifting of a lid part due to folding habit.SOLUTION: A packaging box 1 has a first flap 22 and a second flap 23, which is partially overlapped with an outside of the first flap 22. The first flap 22 has a to-be-inserted portion 30, which is formed in a state penetrating in the thickness direction. The second flap 23 has: an insertion piece 35 that is inserted into the to-be-inserted portion 30; an insertion auxiliary fold line 37, which makes the second flap 23 mountain-folded when the insertion piece 35 is inserted into the to-be-inserted portion 30; and a straightening piece 38, which is divided by a cutting line 38A formed so as to protrude toward a tip side from the insertion auxiliary fold line 37. When the insertion piece 35 is inserted into the to-be-inserted portion 30 and the straightening...

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