A plate stack structure including plate stacks is disclosed. The plate stack structure according to the present invention includes: a base; a plurality of plate stacks having a predetermined shape; a plurality of fixing parts for fixing the plate stacks, respectively; a cover coupled to an end surface of an edge of the base, the cover holding the plate stacks therein; and a support plate commonly placed in the plate stacks, the support plate coming into contact with an inner surface of the cover.