PROBLEM TO BE SOLVED: To provide a small-sized medical treatment tool including a tip portion such as grasping forceps used for surgery, and a surgical system including the medical treatment tool. A medical treatment tool includes an end effector, a wrist member, a shaft, a first pulley, and a second pulley, and a first pulley portion included in the end effector has a first connecting portion. Rotatably attached to the wrist member via the first connecting portion, the first pulley is attached to the wrist member, and the rotation axis of the first pulley is defined by the first connecting portion. Is arranged on the second end side opposite to the first end of the first connecting portion with respect to the groove formed in the first pulley portion and intersecting the plane including the first axis and the shaft axis. [Selection diagram] Fig. 5【課題】手術に用いられる把持鉗子などの先端部を備える医療用処置具であって、小型の医療用処置具、および当該医療用処置具を備える手術用システムを提供する。【解決手段】医療用処置具は、エンドエフェクタと、手首部材と、シャフトと、第１プーリと、第２プーリとを備え、エンドエフェクタに含まれる第１のプーリ部は、第１連結部を介して手首部材に回転可能に取り付けられ、かつ第１連結部の第１端側に配置され、第１プーリは、手首部材に取り付けられ、第１プーリの回転軸は、第１連結部により規定される第１軸、およびシャフト軸を含む面と交差し、かつ第１のプーリ部に形成され溝よりも、第１連結部の第１端と反対側の第２端側に配置される。【選択図】図５
