Use of a barium titanate based coating liquid composition comprising: (a) a sol-gel source material containing (i) at least a barium component selected from a group consisting of barium alkoxides, hydrolyzates of barium alkoxides and condensates of hydrolyzates of barium alkoxides and (ii) at least a titanium component selected from a group consisting of titanium alkoxides, hydrolyzates of titanium alkoxides and condensates of hydrolyzates of titanium alkoxides; and (b) a β-keto ester compound expressed by general formula (1) shown below: where R1 and R2 independently represent respective alkyl groups having not less than 1 and not more than 6 carbon atoms.