Combined chair board

The utility model relates to a combined chair board, comprising a chair back board, a support rod, and a screw cap and a screw bolt which combine the chair back board with the support rod, wherein, the screw cap is provided with a main body of the screw cap, of which the interior is formed with internal threads. The main body of the screw cap penetrates through the chair back board. A cap head is formed on one end of the screw cap. While a lacing part of the other side surface, which is riveted and pressed on the chair back board, is formed on the other end. The screw bolt is provided with external threads. The circumference of the lacing part of the screw cap is circularly provided with a fixed ring. The lacing part can be riveted, pressed, and bent on the chair back board completely and uniformly. While a board surface of the chair back board can not be cracked easily. The anti-loosing effect after the chair back board is combined with the support rod is better.