Provided is a method for oxidizing an sp3C-H bond, which enables high selectivity and high catalyst turnover number. This method for oxidizing an sp3C-H bond is characterized in that an sp3C-H bond is oxidized in the coexistence of a carboxylic acid, using a metal complex catalyst represented by general formula (1) as an oxidation catalyst, or in that an sp3C-H bond is oxidized using a metal complex catalyst represented by general formula (2) as an oxidation catalyst. (In general formula (1), R represents an alkyl group having 1-7 carbon atoms; M represents iron, manganese or coba L represents an arbitrary ligand; X represents a counter ion; and n represents 0, 1 or 2.) (In general formula (2), M represents iron, manganese or coba L represents an arbitrary ligand; X represents a counter ion; and n represents 0, 1 or 2.)
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