Packaging box

Provided is a packaging box comprising a packaging box body and an adhesive sheet adhered to the packaging box body, the packaging box capable of maintaining a sufficiently wide opening even if a hand is released after opening. The packaging box body 10 has a top surface plate 11 and a front surface plate 12, an opening region 10 a opened across the top surface plate and the front surface plate is provided, the opening region is surrounded by a bending scheduled line 10 a and a breaking scheduled line 10 b of the top surface plate, the breaking scheduled line is started from one end of the bending scheduled line or its vicinity, Extends to the front plate beyond the boundary line, then extends to the top plate beyond the boundary line again to reach the other end of the scheduled folding line or its vicinity, while the adhesive...