Abstract: A baby chair includes a main body including a sitting groove having a shape corresponding to an outer surface of a backside of child sitting in the chair and an inner space in a lower end thereof, two front plates each including two insertion gadgets inserted into the inner space from an outer surface of each of a left and right lower end of the main body, two rear plates on an inner surface of the inner space each including two insertion holes into which the insertion gadgets are inserted, binding gadgets protruding toward an opposite direction of each pair of the insertion gadgets from a surface of each front plate, two belt plates each including a binding hole into which the pair of binding gadgets is inserted and rotatably attached thereto, and belt grooves which connect one side of the binding hole to an end of each belt.