To provide a fragrance or perfume improver that can be widely applied to a perfume, a fragrance product, an oral composition and the like, and a method for improving the fragrance or perfume of a fragrance product and the like by using the improver.SOLUTION: The present disclosure provides a fragrance or perfume improver that comprises extract obtained from Cyperus malacceneis Lam. and containing ethyl hexadecanoate and phytol, and a fragrance product or an oral composition comprising the fragrance or perfume improver, and a method for improving the fragrance or perfume of a fragrance product or an oral composition by using the fragrance or perfume improver.SELECTED DRAWING: None

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