Abstract: The present invention relates to a composition comprising a Moutan root bark extract as an active ingredient, and particularly to a composition for the prevention and treatment of athlete's foot, osmidrosis, or acne; a composition for oral cleansing; a bactericidal/disinfectant composition; a composition for eliminating dandruff-causing pathogens and controlling odor, and a functional kitchen detergent composition. The compositions comprising the Moutan root bark extract as an active ingredient of the present invention have superior bactericidal effects against bacteria including athlete's foot-causing pathogens, skin eczema-causing pathogens and skin flora, and fungi, and they can be easily and simply applied to medicines, cosmetics, or cleansing agents.