An endoscope system according to the present invention comprises an endoscope for imaging an in-vivo image of a subject by inserting a distal end portion into a body cavity of a subject, an endoscope connected to the endoscope so that the endoscope can communicate with the endoscope An endoscope system comprising a sensor unit for photoelectrically converting light from the outside to generate an electric signal, a sensor unit for generating an electric signal An output unit for converting the optical signal into an optical signal and outputting the optical signal to the processing device, a detection unit for detecting a connection state between the endoscope and the processing device, and a processing unit And an output limiting unit that limits an output of the received optical signal, wherein the processing device has a light receiving unit that receives the optical signal output by the output unit and converts the optical signal into an electric signal.本発明にかかる内視鏡システムは、被検体の体腔内に先端部を挿入することによって被検体の体内画像を撮像する内視鏡と、内視鏡と通信可能に接続され、内視鏡が撮像した体内画像に所定の画像処理を施す処理装置とを備えた内視鏡システムであって、内視鏡は、外部からの光を光電変換して電気信号を生成するセンサ部と、電気信号を光信号に変換し、処理装置に該光信号を出力する出力部と、内視鏡と処理装置との間の接続状態を検知する検知部と、検知部の検知結果に基づき、処理装置が受光する光信号の出力を制限する出力制限手段と、を有し、処理装置は、出力部が出力した光信号を受光し、該光信号を電気信号に変換する受光部を有する。
