It is an object of the present invention to provide a method of producing a rutile titanium dioxide fine particle having a high ultraviolet protection property and high transparency for visible light. The present invention provides a method of producing a rutile titanium dioxide fine particle, comprising the steps of (1) treating titanium dioxide hydrate with at least one of a basic compound selected from the group consisting of hydroxides of alkalimetal and hydroxides of alkaline-earth metal, and (2) treating the compound obtained by the step (1) with a carboxylic acid group-containing compound and an inorganic acid.
