Problem to be solved. A seat surface section 13 having a seat surface portion 11 and a back plate section 12 extended upwardly from the rear of the seat surface portion 11 is formed, and the upper surface portion of the seat surface section 11 gradually decreases from both sides to the center, and the front end portion of the seat surface area 13 is slightly downward Each side of the back plate 12 is curved upwardly, and both sides of the back plate 15 are extended upwardly, and the upper center of the two projections 15 protrude forwardly, and both sides are curved backward, and the end 16 supports both sides of the lower back . Diagram【課題】人体の下背部に対してサポート効果を発揮する座位姿勢補助装置の提供。【解決手段】座面部11と、座面部11の後方から上方に向かって延伸された背板部12を備え、座面部11の上面に両側から中央に向かって徐々に低くなった座面区域13が形成され、座面区域13の前端部がやや下方に湾曲して斜面14を成し、背板部12の両側がそれぞれ上方に延伸されて凸部15が設けられ、2つの凸部15の上部中央が前方に隆起し、その両側が後方に湾曲されて、下背部両側をサポートする作用端16が構成される。【選択図】図1
