PROBLEM TO BE SOLVED: To provide a flexible tube for an endoscope, in which an arbitrary area where a plurality of tubular members are superposed, can be made softer and harder than a non-processed state, a desired flexibility change can be easily obtained, and superior characteristics can also be obtained in point of durability.SOLUTION: An area where lubrication processing to reduce friction resistance between both the tubular members 11, 12 is applied to the outer surface of an inner tubular member 11 and to the inner surface of the outer tubular member 12 out of two tubular members 11, 12 which are superposed on each other, and an area where friction processing for increasing friction resistance between both the tubular members is applied, are provided in series.COPYRIGHT: (C)2013,JPO&INPIT【課題】複数の管状部材が重ね合わされている任意の領域を無処理の状態より柔軟にも硬質にもすることができて、所望の可撓性変化を容易に得ることができ、耐久性の点でも優れた特性を得ることができる内視鏡の可撓管を提供すること。【解決手段】互いに重なり合う二つの管状部材11,12のうち内側の管状部材11の外表面と外側の管状部材12の内表面とに各々、両管状部材間11,12の摩擦抵抗を減少させる潤滑処理が施された領域と、両管状部材間の摩擦抵抗を増大させる摩擦処理が施された領域とが、直列に設けられている。【選択図】 図4
