To improve the efficiency of the assembly operation of a temporary guard fence, to solve the insufficient yards of the temporary guard fences on an execution field, and to prevent the damage of materials and to reduce transportation cost.

A spacer 3 for fixing a support is formed in a longitudinal sectional stepped shape, and formed in a form that a vertical plate 31 is connected at the lower end of an L-shaped plate 30. A pair of holes 32 and a pair of holes 33 are formed to the spacer 3 for fixing the support, U-bolts 26 are inserted into the holes 32 and fixed by nuts 27, and bolts 34 are inserted into the holes 33 and fixed by nuts 35. The position of the spacer 3 for fixing the support mounted, number, structure or the like can be set properly, and various execution such as structures or the like in which the spacer 3 may be installed not only on a front but also on side faces and the bolts 34 and the nuts 35 are removed and the spacer 3 is fixed onto a continuous footing 4 by the U-bolts 26 or the like can be realized.