PROBLEM TO BE SOLVED: To provide a packaging paper carton appropriate for use in automatized box making, which is free from damage of step portions at the corners of a lid body, and further which is easy to be made into a case. SOLUTION: The step portions 16 at the corners of the lid body are constituted of first step constituent pieces 16a of triangular shape cut to be raised from first connection pieces 14a that connect the neighboring side walls, and of second step constituent pieces 16b which are connected to the first step constituent pieces 16a via uphill fold lines 26 and to the middle parts of second connection pieces 14b via uphill fold lines 27. The first step constituent pieces 16a hold free end edges 16c that are directed perpendicular to the trough fold lines between the first connection pieces 14a and the side walls 13 of the lid body, while the uphill fold lines 26 between the first step constituent pieces and the second step constituent pieces are displaced to the side wall 13 side connected with the first connection pieces from virtual extension lines of uphill fold lines 25 between the first connection pieces and the second connection pieces. The second step constituent pieces 16b hold free end edges 16d at the same height as the free end edges of the first step constituent pieces. See-through holes 20 are provided between the connection pieces and step constituent pieces free end edges to alleviate friction at the time of assembly. COPYRIGHT: (C)2009,JPO&INPIT
