Object: To provide a cell stack device having improved long-term reliability, a module, and a module housing device. Resolution means: A cell stack device provided with a cell stack (5) comprising a plurality of cells (3) that are arranged, a manifold (4) fixing an end of each of the cells (3) thereto with a sealing material (39), and configured to allow a reaction gas to be supplied to the cells (3), and an electrically conductive end member (29) disposed at an end portion of the cell stack (5) in the arrangement direction of the cells (3) and suppressing deformation of the cells (3). A first end of the electrically conductive end member (29) at a side of the manifold (4) is separated from the manifold (4).