Abstract: A posture chair for heavy duty use in business offices and particularly designed to support exceptionally heavy occupants. In order to support heavy occupants a large number of legs are utilized in the chair base to support the chair, preferably eight. The invention further resides in the use of a support plate, such as a heavy gauge metal disc or washer affixed to the legs of the chair, and contoured to conform to the slope of the legs. The disc or washer, preferably formed of steel, is placed in the preferred embodiment under the legs and welded thereto by weld beads placed in the corner at which each side of each leg engages the disc or washer and also between the disc and hub. This results in an exceptionally strong structure sufficient to support very heavy occupants. These elements of the chair base may also be integral and of cast metal, e.g., aluminum.