To provide a guard fence whose various types of patterns made on its shielding board are visible even at nighttime, and which contributes to environmental harmony between the construction site and its circumferential area.

According to the structure of the guard fence, a plurality of small bores 4 are punched in the shielding board 2 so as to make the various types of patterns as a whole. Then the various types of patterns made on the shielding board 2 are illuminated by means of a lighting lamp L from inside the construction site. Further a light diffusing screen 5 is interposed between the shielding board 2 and the lighting lamp L. Furthermore the patterns made on the shielding board 2 can be indirectly illuminated via a reflective board by the lighting lamp L.