To provide a battery casing body capable of improving a yield and a volume efficiency, and a battery with the same.SOLUTION: A battery casing body comprises: first connection parts 24a to 24d connecting between adjacent side surface boards 22a to 22d; and flange boards 23a to 23d bent to an outer side from an upper end of the side surface boards 22a to 22d. In a lid part 30, an outer peripheral part is bonded to the flange boards 23a to 23d, and the first connection parts 24a to 24d are bonded on a first folding line 11 inclined and extended to an outer side from a corner part of a bottom surface board 21 toward an upper direction by double-folding in a valley shape. Second connection parts 26a to 26h connected to the upper end of the first connection parts 24a to 24d through a second folding line 12...

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