An insertion portion, an operation portion, a signal cable, a plate-shaped member, an electric board, and a fixing member are included. The fixing member is formed into a U-shape in which a bottom surface, a top surface, a side surface and a fitting port are formed, and has a stopper for a surplus portion that is fitted in an inside formed, a distance between the bottom surface and the top surface is set to be slightly larger than a diameter in the surplus portion, and the surplus portion is configured not to be disposed in layers in a height direction of the side surface when the surplus portion is housed between the bottom surface and the top surface of the fixing member.
