the present invention provides an endoscope comprising : an insertion unit which is to be inserted into a body ; and a pipeline provided inside the insertion unit for supplying a fluid to a balloon mounted on an outer peripheral surface of the insertion unit , wherein the pipeline has a plurality of openings in an axial direction of the insertion unit on the outer peripheral surface of the insertion unit . therefore , the endoscope of the present invention can easily fix a balloon and keep airtightness after the fixation , and can raise a degree of freedom of a mounting location of the balloon .