PROBLEM TO BE SOLVED: To discover a new material which can efficiently proliferate a stem cell while maintaining its undifferentiated state and provide the material as an agent for maintaining the undifferentiated state of a stem cell or an agent for promoting the proliferation of a stem cell.SOLUTION: An agent for maintaining the undifferentiated state of a stem cell or an agent for promoting the proliferation of a stem cell includes Fritillaria imperialis extract as an active ingredient.SELECTED DRAWING: None【課題】幹細胞を、未分化状態を維持させたまま、効率良く増殖させることができる新たな物質を見出し、幹細胞の未分化状態維持剤又は増殖促進剤として提供すること。【解決手段】フリチラリア・インペリアリスの抽出物を有効成分として含有する、幹細胞の未分化状態維持剤又は増殖促進剤。【選択図】なし
