Abstract: The invention disclosed a folding chair made up by metal tubes whose chair plate apparatus is formed by connecting between the frame member and the plate member by sleeves. The chair plate apparatus consists of the frame member and the plate member; on each side of the plate member is respectively provided with a sleeving; the frame member is provided with a fundamental part, for being leaned against the plate member; and the two side parts are inserted into the each sleeving. The folding chair in this invention is elastic and comfort to sit, much more materials are saved and therefore the cost is reduced.