Codoping effect for alpha-Fe2O3 powder on photocatalytic water oxidation was investigated. Fe2O3 showed activity for water oxidation in aqueous NaIO3 solution by the introduction of a Pt cocatalyst via microwave heating. The activity was much improved by Sr and Ti codoping. We developed for the first time a photocatalyst mainly consisting of d(5) metal ions for water oxidation by utilizing a reversible redox ion.