An endoscope includes a distal end part having a round-chamfered outer peripheral edge, an observation window on an end surface of the distal end part, a nozzle which jets a cleaning fluid toward the observation window, and an observation window base part on which the observation window is placed, the observation window which is formed on the end surface of the distal end part so as to protrude from a surrounding area, and has an outer peripheral shape being formed into a streamline shape in a region facing the nozzle, with respect to a flow of the cleaning fluid jetted from the nozzle.
