Even in a state in which the electric drive with respect to the moving body is disabled, the moving body is made to be in a movable state and occurrence of problems during the treatment is prevented. An imaging optical system that captures an image of an object, an image sensor that photoelectrically converts an image of the object imaged by the imaging optical system, a driving force transmission mechanism that has a transmission gear and transmits driving force to a moving body, and an axis of a fulcrum shaft A manually operated knob that is rotated in the turning direction and is movable between the first position and the second position in the axial direction of the fulcrum shaft, and is connected to the manually operated knob and integrated with the manually operated knob A switching gear that is rotated in the direction around the axis and is moved integrally with the manually operated knob in the axial direction between the meshing position and the non-meshing position, and a drive motor that applies a driving force to the movable body The switching gear and the transmission gear are disengaged at the non-meshing position, and the switching gear and the transmission gear are meshed at the meshing position. [Selection] Figure 26移動体に対する電動駆動が不能とされた状態においても移動体を移動可能な状態にすると共に施術時における不具合の発生を防止する。 被写体を撮像する撮像光学系と、撮像光学系によって撮像された被写体の像を光電変換する撮像素子と、伝達ギヤを有し移動体に駆動力を伝達する駆動力伝達機構と、支点軸の軸回り方向へ回転操作されると共に支点軸の軸方向において第１の位置と第２の位置の間で移動可能とされた手動操作摘子と、手動操作摘子に連結され手動操作摘子と一体になって軸回り方向へ回転されると共に手動操作摘子と一体になって噛合位置と非噛合位置の間で軸方向へ移動される切換ギヤと、移動体に駆動力を付与する駆動モーターとを備え、非噛合位置において切換ギヤと伝達ギヤの噛合が解除され、噛合位置において切換ギヤと伝達ギヤが噛合される。【選択図】図２６
