NOVELTY - A photocatalyst carrying component has a photocatalyst content layer which is formed by heat processing a flaky titanic acid coated on a precoat layer. The flaky titanic acid is obtained by swelling or peeling an interlayer by making the basic compound which has an interlayer swelling effect act on layered titanic acid. The precoat layer is formed by coating precoat composition containing polysilazane or its derivative as main component, on base material, and curing. The base material has a total ion elution amount of 1 mu g/cm or more.    USE - Photocatalyst carrying component. Uses include but are not limited to window glass for home, train and bus, motor vehicle, glass for lighting fixture and cover glass for solar cell.    ADVANTAGE - The photocatalyst carrying component has excellent photocatalyst ability, initial stage stain-resisting ability, abrasion resistance and surface hardness.    DETAILED DESCRIPTION - A photocatalyst carrying component has a photocatalyst content layer which is formed by heat processing a flaky titanic acid coated on a precoat layer. The flaky titanic acid is obtained by swelling or peeling an interlayer by making the basic compound which has an interlayer swelling effect act on layered titanic acid. The precoat layer is formed by coating precoat composition containing polysilazane or its derivative as main component, on a base material, and curing. Three sample plates having a size of 6 cmx 6 cmx 2 mm are immersed in 250 g of distilled water at 80 degrees C for 24 hours, and the base material has a total ion elution amount of 1 mu g/cm or more as calculated by measuring the quantity of alkali metal ion in the distilled water and alkaline-earth metal ion by atomic absorptiometry. An INDEPENDENT CLAIM is included for manufacture of photocatalyst carrying component which involves coating precoat composition on a base layer, curing, forming a photocatalyst content layer by coating suspension liquid of flaky titanic acid on precoat layer and heat processing.