| abstract |
(57) [Problem] Even if a base coat and a photocatalytic coat are formed on the surface of a substrate, there is no appearance of interference color of light, and pictures, patterns, color tones, characters, etc. attached to the surface of the substrate itself. Provided is a surface-treated product having a photocatalytic function capable of maintaining the design of the base without impairing the surface treatment. A surface-treated product having an undercoat formed by applying a base treatment agent containing perhydropolysilazane to the surface of a substrate, and a photocatalytic film laminated on the undercoat, wherein A surface treatment product having a photocatalytic function, wherein the thickness of the photocatalyst film is controlled within a range of 0.01 to 0.5 μm. |