An endoscope which is configured to be connected to an external processing device includes: an insertion part a distal end part including an imaging unit configured to generate image information and an E/O converter configured to convert the image information into an optical signal and to output the converted optical signal a connector part including an O/E converter configured to convert the optical signal into an electric signal, a first output unit configured to convert the electric signal into serial data and to output the converted serial data to the processing device, a second output unit configured to convert the electric signal into an optical signal and to output the converted optical signal to the processing device, and a selector configured to select one of the first output unit and the second output unit and an optical fiber connecting the E/O converter to the O/E converter.
