A wired circuit board having a semi-conducting layer which has excellent chemical resistance, such as acid resistance and alkali resistance, provides no possibility of minute particles being mixed into parts mounted on the wired circuit board; and yet has excellent surface resistivity against electrostatic damage. In the wired circuit board having a conductive layer formed on one side of a base insulating layer in the form of a predetermined wired circuit pattern and a cover insulating layer formed on the conductive layer, a base-side semi-conducting layer and a cover-side semi-conducting layer, which include metal oxide, metal nitride or metal carbide, are formed on the other side of the base insulating layer and the cover insulating layer, respectively, by physical vapor deposition (PVD) or preferably by sputtering.