Provided is a composition for improving blood sugar metabolism, said composition comprising a persimmon leaf extract that is obtained by extracting persimmon leaves with a liquid mixture of 40-60% of ethyl alcohol and water.本發明以提供一種改善及/或提升骨骼肌之糖代謝機能之血糖代謝改善用組成物為目的。藉由本發明,可提供一種含有柿葉萃取物之血糖代謝改善用組成物,其是經由將柿葉以40~60%乙醇-水混合液萃取之步驟而獲得者。