To provide a means for treating or preventing hepatic disease accompanied with inflammation which can reduce or prevent liver damage and is highly safe.SOLUTION: A therapeutic or prophylactic agent for liver diseases accompanied by inflammation which contains as an active ingredient a component selected from a monounsaturated fatty acid having 20 or more carbon atoms, a salt thereof and an ester thereof.Selection drawing None【課題】肝障害を軽減または予防することができ、安全性の高い、炎症を伴う肝疾患の治療または予防手段の提供。【解決手段】炭素数20以上のモノ不飽和脂肪酸、その塩およびそのエステルから選択される成分を有効成分として含有する、炎症を伴う肝疾患の治療または予防剤。【選択図】なし