To provide an agent useful for treating high HDL-cholesterolemia.SOLUTION: The present invention provides an agent for preventing and/or treating high HDL-cholesterolemia, containing pemafibrate or a salt thereof or their solvates.SELECTED DRAWING: None【課題】高HDL-C血症の治療に有効な薬の提供。【解決手段】ペマフィブラート若しくはその塩又はそれらの溶媒和物を含有する、高HDL-C血症の予防及び/又は治療薬。【選択図】なし