| 摘要 |
PURPOSE: A structure of the back of a chair is provided, which keeps a seating posture comfortable by reducing burden on the upper body and reduces inconvenient feeling in case of taking a seat for a long time. CONSTITUTION: A structure of the back of a chair is equipped with a back support consisting of two left and right top back supports(10a) and one bottom support(10b) which is placed under the top back support and has the same width as that of the top back support. The bottom support is arranged in the height which is suitable for supporting the hips and lumbar portion of a seat occupant. The top back support is arranged in the height for supporting the back region of the seat occupant.
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