PROBLEM TO BE SOLVED: To prevent an unwilling press trace from remaining after a press- bonding, provide a favorable appearance, and obtain a joining strength as large as possible without increasing the consumption quantity of a paper material. ;SOLUTION: Front and rear both side walls 2, 2 are connected to a pair of confronted edges of a bottom wall 1, and in the meantime, right and left both side walls 3, 3 are erected on the other confronted edges. To the upper edges of the front and rear, right and left side walls, 2, 2, 3, 3, folding back pieces 4a, 4b, 6 are connected, and the folding back pieces are folded back on the internal surfaces of respective side walls 2, 2, 3, 3, and affixed. At both ends of the right and left side walls 3, 3, first joining pieces 5... are connected, and in the meantime, at both ends of the folding back pieces 6, 6 of the right and left side walls 3, 3, second joining pieces 7... are connected. From the lower corners of the front and rear side walls 2, 2, a diagonal folding line which rises diagonally upward is provided, and the first joining pieces 5... are superposed and affixed to a triangular part on the top of the diagonal folding line, and at the same time, the second joining pieces 7... are superposed and affixed to the folding back pieces 4a... and the first joining pieces 5....;COPYRIGHT: (C)1997,JPO
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