PROBLEM TO BE SOLVED: To provide a collagen gel contraction promoting agent or the like.SOLUTION: A collagen gel contraction promoting agent comprises at least one selected from the group consisting of Macleaya cordata (Wild.) R. Br, Potamogeton natans L, and extracts thereof as an active ingredient.COPYRIGHT: (C)2015,JPO&INPIT【課題】コラーゲンゲル収縮促進剤等の提供。【解決手段】タケニグサ、オヒルムシロ及びそれらの抽出物からなる群より選択される少なくとも1種を有効成分とするコラーゲンゲル収縮促進剤。【選択図】なし