| 摘要 |
PROBLEM TO BE SOLVED: To obtain a foldable tank capable of reducing its breadth as compared with a conventional one when the tank is folded. SOLUTION: A fold line b for folding left and right side surface parts 6, 7 inwardly into a V shape is provided at the central portion of each of the side surface parts 6, 7 of a molding 3 forming a quadrangular cube. By folding them inwardly, the left and right side surface parts 6, 7 are hidden inside of both a front surface part 4 and a rear surface part and, since the side surface parts 6, 7 are not projected, the breadth of the quadrangular cube is reduced by the extent of projection, i.e., by that which corresponds to the extent that the left and right side surface parts 6, 7 are not projected, and can be miniaturized to about 1/2 in its breadth as compared with s conventional one.
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