To reduce the time required for assembly.SOLUTION: A partition body includes a first partition 10, with a tongue-shaped engagement piece 11 formed on the tip of the partition, a second partition 20, having an insertion vertical slit 21, formed on a plate surface through which the engagement piece 11 is inserted, a vertical slit 12 for engagement formed on the engagement piece 11, and an engagement plate 30, set to be inserted into the engagement vertical slit 12 in a gate-bar-like manner. A first upper edge 31, which is an upper edge of the engagement plate 30, extends roughly horizontally from a tip 30a to a rear end 30b. The rear end 30b is provided with an upwardly projecting first upper edge convex part 32 and a first upper edge notch 33, provided at the rear end of the first upper edge convex part 32, into which a second upper...

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