Abstract: A method for selectively arranging ferritin modified with a peptide, which specifically binds to titanium, to titanium formed on a substrate surface is provided. The method for arranging ferritin of the present invention is characterized in that ferritin is selectively bound on titanium on a substrate by modifying the N-terminal part of ferritin with a peptide which specifically binds to titanium. Also, the method for arranging ferritin of the present invention is characterized in that selectivity for titanium can be markedly improved by adding a nonionic surface activating agent.