An active oxygen inhibitor which contains an azole derivative represented by general formula (1) or a salt thereof as the active ingredient, wherein R¹ represents phenyl which may be substituted by 1 to 3 lower alkoxy groups or by a lower alkyleneoxy group, etc.; R² represents hydrogen, phenyl, halogen, lower alkoxycarbonyl, lower alkyl, lower aminoalkyl which may be substituted by lower alkyl, dihydrocarbostyrilyl, etc.; R³ represents the group (α), wherein R4B represents hydroxy, carboxy, lower alkenyl or lower alkyl, and m represents 0, 1 or 2; and X represents sulfur or oxygen.
R²代表氢、苯基、卤素、低级烷氧基羰基、低级烷基、可被低级烷基取代的低级
氨基烷基、二氢羧基等;R³代表基团(α),其中 R4B 代表羟基、羧基、低级烯基或低级烷基,m 代表 0、1 或 2;X 代表
硫或氧。