To provide an accommodation box for easy carriage and storage.

This accommodation box comprises a bottom plate 9b of a box-shaped body, and peripheral walls 9c, 9d, 9e and 9f provided on the periphery of the bottom plate 9b in a foldable manner. An inner surface of an outer box 9 and outer surfaces of the peripheral walls 9c, 9d, 9e and 9f are covered by a bag-shaped cover 11. An inner box comprising a top plate 12b of a box- shaped body and peripheral walls 12c, 12d, 12e and 12f provided on the periphery of the top plate 12b in a foldable manner, assembled in a box shape and opened downwardly is fitted to and accommodated in the outer box 9 covered by the cover 11.