Abstract: Provided is a defense structure for national defense including: a hollow structure which extends from the ground or from underground so as to protect the interior of the defense structure from the concussive or explosive forces of shells or rockets, and which has a plurality of cells which are hollow and are partitioned by cell walls, wherein the plurality of cells are arranged in a set, three-dimensional pattern; and a cladding for surrounding the outside of the hollow structure; and a filler that is selectively filled in hollow portions of the cells.