The guardrail of one of prefabricated component for a boundary is arranged to increase adhesion strength and regardless of skill easily connects a support and a support between a support and a column. The guardrail of one of prefabricated component for a boundary leaves control protrusion (30-1 by being formed, 30-2) formed, united (the 20-1 of projection is left on both ends including the multiple support (10) formed among specified shape and length, 20-2) and correctly project joint (23-3, 23-4), forming multiple column (40) includes that the first control projection fit hole (51) corresponding with left side control protrusion and the raised fit hole (51-2) of the second control and permission control project, left side projection joint and correct projection joint including support, wherein left side control protrusion and permission control projection include left side projection joint and correctly projection joint is inserted into respectively and is connected to the control protrusion fit hole formed on the side of column.
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