A solid material or an oily material for forming an organic thin film is produced by hydrolyzing and condensing at least one kind of organic metal compound expressed by Formula (1) in a lower alcohol-based solvent in the presence of water and an acid with a concentration of 0.5% to 5% by mass in the resultant reaction solution. The solid material or oily material that is obtained is dissolved in an organic solvent, and a substrate is brought into contact with a solution that is obtained to form a highly functional organic thin film on the substrate. [Chemical Formula 1] R1nMXm−n  (I)