The present invention relates to an antimicrobial composition derived from a natural substance. Since the composition effectively suppresses Filobasidium , an organism that has been newly identified as causing dandruff, the present invention can effectively prevent and/or treat seborrhoeic dermatitis and dandruff. Also, since the antimicrobial composition of the present invention includes a natural substance as an active ingredient, little consumer aversion will result. Also, it is expected that the antimicrobial composition of the present invention can be used for developing an antidandruff agent having a reduced content of materials which are typically used as antidandruff agents and the safety of which is questionable.
