| 摘要 |
The invention provides a back rest for a seat back which will not exert too much burden on the thoracic vertebrae and the lumbar vertebrae, resulting in the likelihood of accumulation of fatigue or pain in the lower back after a long hour driving being reduced being reduced. The back rest has a front side having a slight concave extending from the intermediate portion to the upper portion thereof and a convex extending from said intermediate portion to the lower portion, thus forming a configuration following an S line of the human spinal column while having a reverse side provided with reinforcement ribs together with a plurality of slits generally formed in said back rest.
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