The subject innovation is coupled to the upper end portion axially of cancer railing 10, a post 20 on one side to be received the ball formation, the receiving ball end of the addition the other side post 20 male railing 11, which is to be movably inserted is coupled to the upper end, is configured to be coupled to decomposition by a fastening means to the upper end of the flange 30, the lower end of post 20 of the two sides that are each coupled with a clamp 40, and adjusted according to the installed field width so to use, and so that the usability is improved, and at construction sites guardrails that because each member is coupled to decomposed to facilitate the installation and handling of the member when dismantling.
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