Foldable bracket of a chair

A foldable bracket of a chair comprising:

• a positioning rod, a first rotating rod, a connector, a second rotating rod, and a supporting plate, wherein the positioning rod is adapted to be connected with the chair, wherein the first rotating rod is rotatably coupled with the positioning rod, wherein the connector is joined with the first rotating rod, wherein the second rotating rod is rotatably coupled with the connector, and wherein the supporting plate is connected to the second rotating rod, wherein the supporting plate is joined with a fixing seat with three apertures, wherein the fixing seat also includes a pedestal with three tabs fixed therein, wherein the supporting plate is coupled with a holder and the holder includes a biasing spring and an inserting peg, wherein the biasing spring pushes against the inserting peg, and wherein the inserting peg is inserted in one of the three apertures.