To provide a flexible tube and a flexible tube having a uniform and high resilience and capable of smoothly bending and having good insertability without sparsely densely spirally wound wire To the endoscope.SOLUTION: A flexible tube includes a spiral tube in which a strand formed with a sliding surface and a sliding end each having a gradient on both side faces are brought into close contact with each other in a spiral shape and wound, and when curved , The sliding surface and the sliding end which are in contact with each other on the inner circumferential side of the curve are slidably moved to each other, the strands are shifted from each other and overlapped, easily bent, the circumferential length on the inner circumferential side shrinks, The diameter of the bend is reduced.(FIG.【課題】螺旋状の素線に疎密を設けて巻回しなくても、均一で高い弾発性を有し、且つ円滑に曲げることが可能で良好な挿入性を有する可撓管及び可撓管を用いる内視鏡を提供すること。【解決手段】可撓管は、両側面に勾配を有する摺動面及び摺動端がそれぞれに形成された素線を螺旋状に密着させて巻回した螺旋管を含み、湾曲された際に、湾曲の内周側で接触する摺動面と摺動端が互いに摺動移動して、素線同士でずれて重なりを持ち、容易に湾曲されて、内周側の円周長が縮み、曲がりの径が小径化する。【選択図】図4
