| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a chair which has strong support power by improving support rigidity of both of a back board and a backrest frame and also has comfortable sitting feeling as if a sitting person is enwrapped from the right and left sides.SOLUTION: A back board 3 includes a frame part 4 in which both right and left sides and both upper and lower ends have high rigidity, and a flexible part 5 which is formed in an inward part surrounded by the frame part 4 and can elastically deform by being provided with multiple openings. An engaging part 9 is integrally projected rearward in both right and left sides of the frame part 4, and a locking part 8 provided in the right and left sides of a backrest frame 2 is engaged to the engaging part 9 mutually rotatably around an axis in the vertical direction, so that the back board 3 is supported by a front surface of the backrest frame 2.</p> |
