Disclosed is an endoscope (200), with an insertion part thereof being provided with a controllable bent tube (100). The controllable bent tube (100) comprises a plurality of circular tube-shaped tube segments (10) connected in series, wherein one end of each tube segment (10) is provided with a first C-shaped occlusion part (101), with the direction in which an opening thereof opens forming a first included angle (r) with an axial direction of the tube segment that the first C-shaped occlusion part belongs to, and a first C-shaped notch (102) is arranged around the outer side of the first C-shaped occlusion part (101)； and the other end of each tube segment is provided with a second C-shaped occlusion part (111) matching the first C-shaped notch (102) of another tube segment (10), and a second C-shaped notch (112) and a spherical protrusion (113) matching the first C-shaped occlusion part (101) of the another tube segment (10) are provided at an inner side of the second C-shaped occlusion part. The spherical protrusion (113) is difficult to disengage from the first C-shaped occlusion part (101), such that the connection between the tube segments (10) is secure； and the direction in which an opening of the second C-shaped occlusion part (111) opens also forms an included angle (y) with an axial direction of the controllable bent tube (100), thereby further improving the security of the connection.L'invention concerne un endoscope (200), dont une partie insertion est pourvue d'un tube coudé contrôlable (100). Le tube coudé contrôlable (100) comprend une pluralité de segments de tube en forme de tube circulaire (10) reliés en série, une extrémité de chaque segment de tube (10) étant pourvue d'une première partie occlusion en forme de C (101), la direction dans laquelle une ouverture de celui-ci s'ouvre formant un premier angle inclus (r) avec une direction axiale du segment de tube auquel la première partie occlusion en forme de C appartient à, et une première encoche
