PROBLEM TO BE SOLVED: To provide a surface treatment agent giving not a resin coating having problems such as deterioration of lubricity due to peeling-off, turn-up, and the like during movement inside a tube but a chemically fixed lubricating surface, and to provide a medical instrument, such as a catheter, at least partially surface-treated with a surface treatment agent.SOLUTION: A surface treatment agent for a medical instrument comprises a copolymer of a hydrophilic functional group-containing monomer and an epoxy group-containing monomer.SELECTED DRAWING: None【課題】管内の移動時に剥がれやめくれ等により潤滑性が低下する等の問題点がある樹脂コーティングではなく、化学的に固定化された潤滑表面を与えることが可能な表面処理剤、及び該表面処理剤で少なくとも一部が表面処理されたカテーテル等の医療器具を提供する。【解決手段】親水性官能基含有モノマー及びエポキシ基含有モノマーの共重合体を含む医療器具用表面処理剤に関する。【選択図】なし
