PROBLEM TO BE SOLVED: To make an outer diameter of an insertion part small in an endoscope device, and manufacture the endoscope device easily.SOLUTION: An endoscope device 50 includes an insertion part 20 inserted into a subject, a sheath tube 6 disposed in the periphery of the insertion part 20, a fixing part 1a, at least a part of which is inserted inside the sheath tube 6, and which comes in contact with the inner peripheral surface of the sheath tube 6, a binding thread 5A which is flat in a state that at least a gap in the central part in a radial direction is crushed, and which is wrapped around the outer peripheral surface of the sheath tube 6 so that the surface in the longitudinal direction of the flat cross section comes in contact with it, and fixes the sheath tube 6 to the fixing part 1a, and a resin layer 4A laminated on the sheath tube 6 so as to cover the binding thread 5A.SELECTED DRAWING: Figure 1【課題】内視鏡装置において、挿入部の外径を小径化することができ、製造も容易となるようにする。【解決手段】内視鏡装置５０は、被検体内に挿入される挿入部２０と、挿入部２０の外周部に配置される外皮チューブ６と、外皮チューブ６の内部に少なくとも一部が挿入されており、外皮チューブ６の内周面に当接している固定部１ａと、少なくとも径方向の中心部の空隙が押しつぶされている状態で扁平になっており、外皮チューブ６の外周面に扁平断面の長手方向の表面が当接するように巻き回されて、外皮チューブ６を固定部１ａに固定している緊縛糸５Ａと、緊縛糸５Ａを覆うように外皮チューブ６上に積層された樹脂層４Ａと、を備える。【選択図】図１
