An endoscope comprising:a hand operation section；an insertion section including a leading end part, a curving part, and a flexible part that are placed in the stated order from a leading end side to a base end side on which the hand operation section is placed, the leading end part having a leading end surface on which an observation window for observing an inside of a subject's body is provided,the curving part being remotely operated for curving by operating the hand operation section so as to cause the leading end part to face a desired direction,the flexible part connecting the curving part with the hand operation section and being able to curve in a desired direction along an insertion into the subject's body；a gas supply channel formed inside of the insertion section； anda gas jetting port that is communicated with the gas supply channel, and is placed so as to be closer to the base end side than the leading end surface on which the observation window is provided.
