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.

Foundation connecting members 9 have height adjusting members 92, which ensure height, in which guard rails 52 can be housed when the guard rails 52 are housed in a housing space 7, and adjust height so that the load of H-steel materials 6 on the upper sides does not act on the guard rails 52, composed of square-shaped plate materials and have tapped holes 91, upper- lower connecting members 94 connecting the upper-lower H-steel materials 6, consisting of the square-shaped plate materials and having tapped holes 93a, 93b, bolts and nuts 95 being screwed to the tapped holes 91, 93a and connecting the height adjusting members 92 and the upper-lower connecting members 94, tapped holes 96 bored at four places in response to the tapped holes 93a, 93b, and bolts and nuts 97 being screwed to the tapped holes 93b, 96 and connecting the upper-lower connecting members 94 and the first vertical plates 6b and the second vertical plates 6c.