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In this study, the functions required of automotive seats were analyzed from the standpoint of occupant posture. The results have been incorporated in the development of the New Generation Ergonomic Seat, which better fits the contours of the human body and prevents a stooped posture that places a greater load on the lumbar region, thereby reducing fatigue during long hours of driving. The new seat adopts the concept of “combined pelvic and lumbar support,” based on an analysis of the muscular and skeletal structure of the human body, sitting posture and body pressure distribution.