The present invention relates to (1) a transparent coating film containing a layered titanate containing an organic cation derived from amines having a boiling point of 300.degree. C. or lower as measured under an ambient pressure, and having an atomic ratio of nitrogen to titanium of 0.01 to 0.3; and (2) a process for producing a transparent coating film having an atomic ratio of nitrogen to titanium of 0.01 to 0.3, containing the steps of applying a solution containing an organic cation derived from amines having a boiling point of 300.degree. C. or lower as measured under an ambient pressure, and a layered titanate onto a substrate; and heat-treating the thus applied solution at a temperature less than 450.degree.C. The coating film exhibits a high hardness, an excellent transparency, a low photocatalytic activity and an excellent stability as well as a good adhesion property to a substrate.