The purpose of the present invention is to provide a flexible tube for an endoscope, the flexible tube being configured by forming flexible tube sections, which consist of different types of materials, into a single part without providing a connection transition section. As a result of the configuration, the flexible tube for an endoscope has a small diameter, improved durability, and increased easiness of assembly. In order to obtain the above-mentioned flexible tube for an endoscope, the flexible tube is formed by interconnecting at least three or more flexible tube sections which are: a distal-most flexible tube section a proximal-most flexible tube section and an intermediate flexible tube section disposed between the distal-most flexible tube section and the proximal-most flexible tube section. The connection portion between the distal-most flexible tube section and the intermediate flexible tube section is formed by a resin changing section, and the proximal-most flexible tube section is formed to have a greater wall thickness than the remaining flexible tube sections other than the proximal-most flexible tube section.La présente invention vise à fournir un tube flexible pour endoscope, le tube flexible étant configuré par formation de sections de tube flexible, qui consistent en différents types de matières, en une seule partie sans prévoir une section de transition de liaison. Par suite de la configuration, le tube flexible pour endoscope a un petit diamètre, une durabilité améliorée et une facilité augmentée dassemblage. Afin dobtenir le tube flexible susmentionné pour endoscope, le tube flexible est formé par interconnexion dau moins trois sections de tube flexible ou plus qui sont : une section de tube flexible dextrémité distale une section de tube flexible dextrémité proximale et une section de tube flexible intermédiaire disposée entre la section de tube flexible dextrémité distale et la section de tube flexible dextrémité proximale. La partie de lia
