An objective lens 21 a, an imaging device 25, a treatment instrument elevator base, a signal extraction unit 61, a signal processing unit 62, a monitor 15, an instruction unit 3 j, a storage unit 63, and a control unit 60, The control unit 60 instructs the signal extracting unit 61 to switch the image displayed on the monitor 15 to another field of view range different from the current viewing field range among the plurality of viewing field ranges at every input from the instructing unit 3 j And instructs the extraction operation.対物レンズ21aと、撮像素子25と、処置具起上台と、信号抽出部61と、信号処理部62と、モニタ15と、指示部3jと、記憶部63と、制御部60とを具備し、制御部60は、指示部3jからの入力の毎に、モニタ15に表示される画像が複数の視野範囲の内、現在の視野範囲とは異なる他の視野範囲に切り替わるよう、信号抽出部61に抽出動作を指示する。
