The operation of the main function of the end effector is performed while the posture of the end effector is stabilized, and the limitation of the operation amount due to the movable range of the wrist is eased. An operation input device (2) for inputting an operation command to a manipulator having an end effector for observing or treating an affected area, and a gripper (25) that can be held and held by the same hand of an operator (O) An operation input device (2) is provided that includes an operation unit (16) that is provided in the gripping unit (25) and is operated by the same single finger before and after the changeover to operate the main function of the end effector.エンドエフェクタの主機能の操作をエンドエフェクタの姿勢を安定させたまま行うとともに、手首の可動範囲による操作量の制限を緩和する。患部の観察または処置を行うエンドエフェクタを有するマニピュレータへの操作指令を入力する操作入力装置（２）であって、操作者（Ｏ）の同一の手によって持ち替えて把持可能な把持部（２５）と、該把持部（２５）に設けられ、持ち替え前後において同一の単一指により操作されエンドエフェクタの主機能を操作する操作部（１６）とを備える操作入力装置（２）を提供する。
