The present invention relates to a composition for preventing hair loss and promoting hair growth, which comprises phytoestrogen as an active ingredient and, more particularly, to a pharmacological composition, a cosmetic composition, and a health functional food composition, for preventing hair loss and promoting hair growth, the composition comprising, as an active ingredient, phytoestrogen, which is an estrogen structural analogue derived from a leguminous plant.La présente invention concerne une composition visant à prévenir la chute des cheveux et à en favoriser la pousse, qui comprend un phytoœstrogène en tant que principe actif et, plus particulièrement, une composition pharmacologique, une composition cosmétique et une composition alimentaire fonctionnelle de santé, visant à prévenir la chute des cheveux et à en favoriser la pousse, la composition comprenant, en tant que principe actif, un phytoœstrogène, qui est un analogue structural d'œstrogène issu d'une plante légumineuse.본 발명은 피토에스트로겐을 유효성분으로 포함하는 탈모 방지 및 모발 성장 촉진용 조성물에 관한 것으로, 보다 상세하게는 콩과식물로부터 유래된 에스트로겐 구조 유사체인 피토에스트로겐을 유효성분으로 포함하는 탈모 방지 및 모발 성장 촉진용 약학적 조성물, 화장료 조성물 및 건강기능성 식품 조성물에 관한 것이다.