A front receiving plate (1), a bottom face plate (2), a rear face plate (3), a top face plate (4), and a front face plate (5) in which a product is encased are sequentially arranged one after another, and bottom side plates (6), rear side plates (7), top side plates (8), and front side plates (9) are arranged one after another on both sides of the area from the bottom face plate (2) to the front face plate (5), respectively. The front receiving plate (1), the bottom face plate (2), the rear face plate (3), the bottom side plates (6), and the rear side plates (7) are treated as component items of a tray part (21), whereas the top face plate (4), the front face plate (5), the top side plates (8), and the front side plates (9) are treated as component items of a lid part (22). Cut lines (12a) for separating the tray part (21) from the lid part (22) are inserted so as to pass through any of the regions from the rear face plate (3) to the top face plate (4). In exhibition, the cut line (12a) is cut off so as to separate the tray part (21) from the lid part (22).