PURPOSE: A composition containing Lardizabalaceae extract is provided to suppress adipocyte differentiation and to prevent and treat obesity. CONSTITUTION: A pharmaceutical composition for preventing and treating obesity contains Lardizabalaceae extract as an active ingredient. The Lardizabalaceae extract is prepared from Lardizabalaceae leaves, stems, or whole plant using water, low carbon number alcohol of 1-4 carbon atoms, or a mixture thereof. A health functional food for preventing and treating obesity contains the Lardizabalaceae extract as an active ingredient. The health functional food is powder, granules, tablets, capsules, or drinks. A food additive for preventing and treating obesity contains the Lardizabalaceae extract as a main ingredient.본 발명은 으름덩굴 추출물을 유효성분으로 함유하는 비만증의 예방 및 치료용 조성물에 관한 것이다.