PROBLEM TO BE SOLVED: To provide a denture antifouling agent that has a high effect of preventing the attachment of stains, particularly food particles, to a denture, and a denture care composition containing the same.SOLUTION: The present invention provides: a denture antifouling agent that contains (A) component of pyrrolidone carboxylic acid or a salt thereof a denture antifouling agent that contains the component (A), and (B) component of a surfactant and a denture care composition containing the same.SELECTED DRAWING: None【課題】義歯への汚れ、特に食渣汚れの付着抑制効果が優れる義歯防汚剤及びこれを含有する義歯ケア組成物を提供する。【解決手段】(A)ピロリドンカルボン酸又はその塩からなる義歯防汚剤、前記成分(A)と(B)界面活性剤とからなる義歯防汚剤、及びこれらを含有する義歯ケア組成物。【選択図】なし