To give conductivity without losing design by mixing photo catalyzer and a raw material having conductivity on a base material at a specific material and forming a surface layer having the difference between specific surface resistant values.

After the surface of a base material 1 such as a tile and a calcium silicate plate is washed, conductive oxide 3 such as tin oxide and antimony oxide and titanium oxide as photo catalyzer 2 are applied on the surface of the base material 1, after coating baking or drying is performed and a thin film is immobilized. At this time, the surface area of the photo catalyzer 2 is 50% or larger of the area of the conductive oxide 3, a difference between the surface resistant values of an photo catalyzer simple substance layer (A layer) and a conductive oxide layer (B layer) formed on the base material 1 is log A-B≥1 when the A layer is made A Ω.cm and the B layer is made Bram. Since a close transparent conductive thin film can be immobilized on only the surface of the base material 1, the product of any design can be worked into conductive one.