An electronic endoscope is provided that is capable of not only the insertion portion being freely detachable, but the diameter of the distal end portion of the insertion portion being reduced so that the burden on the patient is alleviated. For that reason, the electronic endoscope of the present invention includes an elongated insertion portion inserted into a subject, a distal end of the elongated insertion portion including a solid state imaging device, an operating portion connected to an other end of the insertion portion so as to be freely attachable thereto or detached therefrom, and an interface substrate that processes RAW data obtained by the solid-state imaging device and that creates and outputs image signals, where at least part of an interface substrate is disposed inside the operating portion, and a first electrical cable that transmits the RAW data obtained by the solid-state imaging device is connected to a connector located on the interface substrate or located on the way toward the interface substrate, and when the insertion portion is being attached to or detached from the operating portion, the first electrical cable is attached or detached at a connector portion.
