More particularly, the chair 1 comprises a support frame 100 formed of a synthetic resin material and formed so that the backrest 110 and the seat 120 are integrally connected to each other, The chair 1 is attached to both sides of the support frame 100 and is detachably connected to both side frame frames 200 formed of a synthetic resin material corresponding to the side surface shape of the support frame 100. The chair 1 is disposed in the longitudinal direction And the side frame frame 200 of the chair 1 is divided into a narrow width and a wide width so as to be separated from the support frame 300 100 so that the width of the chair 1 can be adjusted. Thus, the synthetic resin material can be detachably coupled to both sides of the chair support frame in which the seat and the back are integrally formed The frame width of the frame frame is narrowed and the frame width of the synthetic resin frame is divided into a wide range so that the width of the chair can be adjusted to a desired width, thereby reducing the manufacturing cost and installation cost , It is easy to install and disassemble.
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