Provided is an endoscope system including: a mantle tube into which an insertion part of an endoscope is inserted a fluid flow channel which is formed of a space between an outer surface of the endoscope inserted into the mantle tube and an inner surface of the mantle tube a sealing member which seals the fluid flow channel and a pipe line which is formed inside of the insertion part so as to communicate between the fluid flow channel and a nozzle formed on a leading end surface of the insertion part, and supply a fluid from the fluid flow channel to the nozzle, and further including a first fixing device which fixes the insertion part at a position at which a leading end of the insertion part is not exposed to an outside from a leading end of the mantle tube. Accordingly, it is possible to efficiently supply a cleaning liquid without providing a special flow channel when the cleaning liquid is supplied through the mantle tube, and facilitate the insertion of the insertion part of the endoscope into the mantle tube.
