PURPOSE: A safety guide rail assembly including excellent workability and excellent stability is provided to reinforce the strength of a plate and lightening the weight of the plate. CONSTITUTION: Two plates (10,10') of reinforced plastics are connected by a connection bracket (20). A plurality of penetration channels penetrates from one end of the inside of the plate to the other end. A fixing bracket (30) connects the connection bracket to a post (100) with a fixing bolt and a nut.
