| 摘要 |
A packaging case 1 is formed of a unitary blank 1 a of paper material. The unitary blank 1 a has at least two fold lines 2 a, 2 b between which a back side wall 6 a is formed and both sides of which a bottom wall 10 and a top wall 11 are formed. The unitary blank 1 a has also incisions 3 a, 3 b formed on both ends of the fold lines 2 a, 2 b. The unitary blank is deep drawn to form side walls 6 on each periphery of the bottom wall 10 and the top wall 11 and form rims 8 a, 8 b protruding outwardly from each upper end of the side walls 6. The unitary blank is folded along the fold lines 2 a, 2 b so that the rims 8 a, 8 b come into contact with each other, whereby the bottom wall 10, the top wall 11, the back side wall 6 a and the side walls 6 constitute an inner space.
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