PROBLEM TO BE SOLVED: To provide a material that can improve a walking function.SOLUTION: The present invention provides an agent for improving the walking function of a patient of mild knee osteoarthritis, an agent for inhibiting the deterioration of a walking function caused by knee osteoarthritis, or an agent for preventing a walking dysfunction caused by knee osteoarthritis, each of which contains catechin as an active ingredient.SELECTED DRAWING: NoneCOPYRIGHT: (C)2018,JPO&INPIT【課題】歩行機能を改善することができる素材の提供。【解決手段】カテキン類を有効成分とする軽度変形性膝関節症患者の歩行機能改善剤、変形性膝関節症に伴う歩行機能低下の抑制剤、又は変形性膝関節症に伴う歩行機能障害の予防剤。【選択図】なし