Provided are triarylamine derivatives excellent in compatibility with various organic solvents or resins, capable of forming a silicon-oxygen bond on the surface of an inorganic material, and allowing easy purification; a preparation process of the triarylamine derivative; an intermediate product of the triarylamine derivative; an inorganic composite material obtained by bonding the triarylamine derivative to the surface of an inorganic material; and a preparation process of the inorganic composite material.