| 摘要 |
<p>A chair (1), wherein a seat back part provided at the rear part of a seating part is divided into a seat back upper frame (55) and a seat bacl lower frame (50), and a first state capable of tilting the entire seat back frame (5) rearward and a second state capable of tilting the seat back upper frame (55) rearward relative to the seat back lower frame (50) are provided and the first and second states are formed so as to be switchable with each other, whereby the upper part of a seated person from the waste corresponding to the seat back part can be moved freely.</p> |
