Has a distal end rigid portion body of the insulative tip is provided an insertion portion to be inserted in the bore, the proximal end of the insertion portion, an electronic endoscope, a connector is electrically connected to the ground portion ground metal member which forms the structure of the insertion portion provided between the operating portion having a connecting portion, and said operating portion and the distal end rigid portion body of the insertion portion, conduction with the ground portion through the connector connecting portion and, an observation optical system and a frame member having electrical conductivity and optical elements, for holding the optical element, is extended toward the operating portion from the distal end of the insertion portion, the frame of the observation optical system I and a conductive connection portion for conducting to the ground metal member to member.電子内視鏡は、先端に絶縁性の先端硬質部本体を有し、孔内に挿入される挿入部と、前記挿入部の基端部に設けられ、グランド部に電気的に接続されるコネクタ接続部を有する操作部と、前記挿入部の先端硬質部本体と前記操作部との間に設けられ前記挿入部の構造体を形成し、前記コネクタ接続部を通して前記グランド部と導通する接地金属部材と、光学素子と、前記光学素子を保持する導電性を有する枠部材とを有し、前記挿入部の先端から前記操作部に向かって延出された観察光学系と、前記観察光学系の枠部材を前記接地金属部材に導通させる導電接続部とを有する。
