The endoscope (12) has the insertion portion inserted into a body cavity by (20), the curved portion of the three (23,231,233,235) at least curved. The curved portion (23), ligated curved portion of the first is disposed on the tip side (20) the insertion portion is curved in the vertical and horizontal direction (231), the curved portion and the first (231), upper and lower ligated bending portion a second curved in direction (233), the curved portion and the second (233), greater than (233) the curved section of the second curved portion of the third to be bent in the horizontal direction (235 by a), and is formed at least.内視鏡(12)は、湾曲する少なくとも3つの湾曲部(23,231,233,235)を、体腔内に挿入される挿入部(20)にて有している。湾曲部(23)は、挿入部(20)の先端部側に配設され、上下左右方向に湾曲する第1の湾曲部(231)と、第1の湾曲部(231)と連結し、上下方向に湾曲する第2の湾曲部(233)と、第2の湾曲部(233)と連結し、第2の湾曲部(233)よりも長く、左右方向に湾曲する第3の湾曲部(235)とによって、少なくとも形成されている。
