PROBLEM TO BE SOLVED: To provide an immune function regulator that is useful for regulating immune function and maintaining the homeostasis of a living body and to provide an antioxidant that prevents adult diseases.SOLUTION: Provided is a pyrrole derivative represented by the following formula (1) or a salt thereof.SELECTED DRAWING: NoneCOPYRIGHT: (C)2017,JPO&INPIT【課題】免疫機能を調整し、生体の恒常性を維持するために有用な免疫機能調整剤及び成人病を予防する抗酸化剤の提供。 【解決手段】下記式(1)で示されるピロール誘導体又はその塩。【選択図】なし