FOLDING TYPE RETURNABLE BOX

PROBLEM TO BE SOLVED: To provide a folding type returnable box capable of being easily folded and excellent in a cold insulation function and/or a heat insulation function.SOLUTION: A folding type returnable box comprises; a box body 10 including a regular square or rectangular bottom surface part 11, front and back, left and right side wall parts 12, 12, 13 and 13 corresponding to the respective sides of the bottom surface part 11, a lid part 14 extended from the upper side of the back side wall part 12, and a reinforcing plate 15 for reinforcing the bottom surface part 11. The reinforcing plate 15 is rotatably mounted on the lower side of the front or back side wall part 12. The side wall parts 12, 12, 13 and 13, the lid part 14 and the reinforcing plate 15 are formed by enclosing a plate material in the inner and outer double sheet plates. The bottom surface part 11 is formed of a foldable sheet material. When the central part of the bottom surface part 11 is pulled up, the side wall parts 13 and 13 can be folded inward. The sheet material forming the bottom surface part 11 and the outer sheet material forming the side wall parts 12, 12, 13 and 13 and the outer sheet material forming the cover part 14 are tarpaulin sheets.