Introduction device includes an operation body 32 which first surface 46 is provided a grip portion 33 along the longitudinal axis 35 while adjacent to the main operation unit 32, and a second direction intersecting the first direction a first direction A first rotatable body 51 rotatable about a first shaft 56 protruding from the first face 46 and operable when the bending portion 37 is bent in the first direction, rotatable about a second shaft portion 61 projecting from the operating body 32, while being operated when bending the bending portion 37 in the second direction, the tip end direction side of the first shaft portion 56 of the outer edge 63 the portion located in located on the extension surface 64 which extends the first surface 46 or the first shaft portion 56 than the distal direction side portion of the first shaft portion 56 extending surface 64 of the outer edge 63 groups of the first shaft portion 56 of the outer edge 63 as well as position in the distal direction side It comprises a second rotating body 52 in which a portion in the direction side is positioned in the proximal direction side of the first shaft portion 56 than the extension surface 64, the.導入装置は、第1面46が設けられる操作本体32と、操作本体32と隣接するとともに長手軸35に沿ったグリップ部33と、第1方向と前記第1方向と交差する第2方向とに湾曲可能な湾曲部37と、第1面46から突出する第1軸部56を中心に回転可能で、湾曲部37を前記第1方向に湾曲させる際に操作される第1回転体51と、操作本体32から突出する第2軸部61を中心に回転可能で、湾曲部37を前記第2方向に湾曲させる際に操作されるとともに、外縁63のうちの第1軸部56の先端方向側にある部分が第1面46を延長した延長面64上に位置するか、外縁63のうちの第1軸部56の先端方向側にある部分が延長面64よりも第1軸部56の前記先端方向側に位置するとともに外縁63のうちの第1軸部56の基端方向側にある部分が延長面64よりも第1軸部56の前記基端方向側に位置する第2回転体52と、を備える。
