To provide an operation device of a medical treatment device, a medical treatment system and an operation method of the medical treatment device which can be adjusted to a desired action change with the operation of an operation part and operate an action part.SOLUTION: An operation device of a medical treatment device includes: an operation part which operates the action of an action part acting in the medical treatment device that can perform at least any action of ascending/descending, rising/falling, expanding/contracting and rotating； and a control part which controls the driving of a drive part driving the action part based on the operation of the operation part. The control part is configured to execute adjustment processing of adjusting the action change of the action part with the drive part in accordance with the operation of any of the operation pressure and operation time of the operation part.SELECTED DRAWING: Figure 1【課題】操作部の操作によって所望の動作変化に調整して動作部を動作させることができる医療用診療装置の操作装置、医療用診療システム、及び、医療用診療装置の操作方法を提供することを目的とする。【解決手段】医療用診療装置の操作装置において、少なくとも昇降、起倒、伸縮、及び、回転のうち何れかの動作が可能な医療用診療装置において動作する動作部の動作を操作する操作部と、該操作部の操作に基づいて前記動作部を駆動する駆動部の駆動を制御する制御部とで構成され、前記制御部が、前記操作部の操作圧力及び操作時間のいずれか一方の操作に応じて、前記駆動部による前記動作部の動作変化を調整する調整処理を実行するように構成した。【選択図】図１
