The endoscope (2) has a distal end member (21) provided at a distal end portion (6) of the insertion portion (9), a contact surface (33 a) formed on a part of the outer circumference of the functional member (30) , A first hole portion (22) formed in the distal end member (21) and on which the functional member (30) is disposed, a first hole portion (22) in the distal end member And a second hole portion (23) formed in a tangential direction with respect to the contact surface (33a) of the functional member (30) disposed in the first hole portion (22), the second hole portion , Inserted into the second hole portion (23) and rotated around the axis center at a predetermined angle , whereby the abutting surface (33 a) is deformed by being in contact with the midway portion, whereby the functional member 30) fixed to the tip member (21).内視鏡(2)は、挿入部(9)の先端部(6)に設けられた先端部材(21)と、機能部材(30)の外周一部に形成された当接面(33a)と、先端部材(21)に形成され、機能部材(30)が配設される第1の孔部(22)と、先端部材(21)に第1の孔部(22)の第1の孔軸に直交する第2の孔軸を備え、第1の孔部(22)に配置された機能部材(30)の当接面(33a)に対する接線方向に形成された第2の孔部(23)と、第2の孔部(23)に挿入されて、所定の角度θで軸心回りに回転されることで当接面(33a)に中途部分が接触して変形することで、機能部材(30)を先端部材(21)に固定する固定部材(50)と、を具備する。
