| 摘要 |
PROBLEM TO BE SOLVED: To provide a chair for constantly holding a proper posture in case of performing work with variously changing postures. SOLUTION: A seat back plate 14 is formed of an upper shell 14a and a lower shell 14b, an upper part of the upper shell 14a is installed on an upper part of a seat back frame 10 to be slidable in a vertical direction, and rotatable around a lateral pivotal shaft 38, and a lower part of the lower shell 14b is installed on a lower part of the seat back frame 10 to be rotatable around a lateral pivotal shaft 40a, A lower part of the upper shell 14a and an upper part of the lower shell 14b are connected to each other through bent parts 14a which can be elastically bent forward and back.
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