An electronic endoscope includes an insertion portion including an insulative distal end hard portion main body at a distal end thereof, an operation portion provided at a proximal end portion of the insertion portion and including a connector connection electrically connected to a ground portion, a ground metal member provided between the main body and the operation portion, forming a structure of the insertion portion, and being electrically conductive to the ground portion through the connector connection, an observation optical system including an optical element and a frame member having conductive properties and holding the optical element, and being extended from the distal end of the insertion portion toward the operation portion, and a conductive connecting portion allowing the frame member of the observation optical system to become electrically conductive with respect to the ground metal member.