A bending operation input unit provided with a bending operation input unit for performing a bending operation of the bending portion is removably attached to the operation portion main body, provided in the bending operation input unit, an endoscope, in the bending operation input unit and a, an actuating unit operating state changes in response to the bending operation. Provided in the operation portion main body in a state between the actuating portion is electrically insulated, the operating state detecting unit for detecting the operating state of the actuating portion, the endoscope is detected by the operating state detecting unit I comprises a bending operation detection unit based on the operating state of the operating portion which is to detect the bending operation in the bending operation input portion.内視鏡は、湾曲部の湾曲操作を行う湾曲操作入力部を備え、操作部本体に着脱可能に取り付けられる湾曲操作入力ユニットと、前記湾曲操作入力ユニットに設けられ、前記湾曲操作入力部での前記湾曲操作に対応して作動状態が変化する作動部と、を備える。内視鏡は、前記作動部との間が電気的に絶縁された状態で前記操作部本体に設けられ、前記作動部の作動状態を検出する作動状態検出部と、前記作動状態検出部で検出された前記作動部の作動状態に基づいて、前記湾曲操作入力部での前記湾曲操作を検出する湾曲操作検出部と、を備える。
