To provide an antifungal agent for water-soluble metal processing oil containing a cyclohexylamine derivative, and a water-soluble metal processing oil agent composition containing the same.SOLUTION: The present invention provides an antifungal agent for water-soluble metal processing oil containing a cyclohexylamine derivative represented by formula (1) and a water-soluble metal processing oil agent composition containing the same (R1 and R2 each independently represent H or a C4-18 saturated/unsaturated linear/branched hydrocarbon group, and at least one of them is a hydrocarbon group).SELECTED DRAWING: None【課題】シクロヘキシルアミン誘導体を含有していることを特徴とする水溶性金属加工油用防黴剤及びそれを含有する水溶性金属加工油剤組成物の提供。【解決手段】式（１）で表されるシクロヘキシルアミン誘導体を含有している水溶性金属加工油用防黴剤及びそれを含有する水溶性金属加工油剤組成物。（Ｒ1及びＲ２は各々独立に、Ｈ又はＣ４～１８の飽和／不飽和の直鎖／分岐の炭化水素基、少なくとも一方は炭化水素基）【選択図】なし
