The endoscope 1 includes an insertion portion 2 that the distal end portion 6 and the bending portion 7 is disposed , is formed on the distal end portion 6 , and inclined to the s side of each adjacent the distal end surface 20a of the distal end portion 6 crossing is formed so as to be formed by a direction substantially perpendicular to the front end surface ridge 24a and the curved portion 7 formed by intersecting the 20a is curved , the inner wall of the bent portion of the insertion portion 2 is inserted conduit 100 by providing an inclined surface 24 which is the insertion portion 2 to vary the position as the bending direction of the bending portion 7 is rotated to match the bending direction of the bent portion by abutting and , it is costly with a simple construction without , it is possible to improve the passage of the curved portion of the insertion portion to the bending line . .内視鏡1は、先端部6および湾曲部7が配設された挿入部2と、先端部6に形成され、先端部6の先端面20aに隣接する側面の夫々に対して傾斜して交差するように形成され、先端面20aに交差して形成された稜線24aと湾曲部7が湾曲する方向と略直交して形成され、挿入部2が挿入された管路100の屈曲部の内壁に当接することで挿入部2が回転されて湾曲部7の湾曲方向が屈曲部の屈曲方向と一致するように姿勢を可変する傾斜面24と、を備えることで、簡単な構成によりコスト高となることなく、屈曲管路への挿入部の湾曲部の通過性を向上させることができる。
