An insertion section 5 an elongated to be inserted into the subject, and the curved portion 11 of the first bendable alone, bendable in the same direction as the bending direction of the bending portion 11 of the first curved portion 11 with a first a bending portion 10 and a curved portion 13 of the second such, the flexible tube 15, inserted through the insertion portion 5, the wire 20 has a first fixed to the tip of the curved portion 11 of the first tip and, the guide pipe 21 of the first fixed between the flexible tube 15 the wire 20 first is inserted therein so as to advance and retreat with respect to the insertion direction S, a curved tip portion 10, the insertion It comprises fixed between the curved portion 13 of the second curved portion 11 of the first being inserted into the section 5 in the tip, the wire 30 of the second curing the curved portion 13 by a second traction and characterized in that it has.被検体内に挿入される細長な挿入部5と、単独で湾曲自在な第1の湾曲部位11と、第1の湾曲部位11とともに該第1の湾曲部位11の湾曲方向と同一方向に湾曲自在な第2の湾曲部位13とを有する湾曲部10と、可撓管部15と、挿入部5内に挿通された、先端が第1の湾曲部位11の先端に固定された第1のワイヤ20と、第1のワイヤ20が挿入方向Sに対して進退自在に内部に挿通された、先端が湾曲部10と可撓管部15との間に固定された第1のガイドパイプ21と、挿入部5内に挿通された、先端が第1の湾曲部位11と第2の湾曲部位13との間に固定された、牽引により第2の湾曲部位13を硬化させる第2のワイヤ30とを具備していることを特徴とする。
