In a method of manufacturing an endoscope according to the present invention, a heat-shrinkable tube is produced by folding a first molded body in which a notch portion is formed by forming a cutout from directions facing each other in a part of an elastically deformable tube and aligning end portions thereof, each of a plurality of bundle portions formed by branching some of a plurality of signal lines is inserted into each cylindrical portion of this heat-shrinkable tube to be covered by heat shrinkage, and thereafter, a channel is inserted into a gap formed by the plurality of cylindrical portions, and one end of the channel is connected to a distal end constituting portion.
