The insertion device tube is an insertion device tube which is arranged on the outer periphery of the insertion part of the insertion device to be inserted into the subject and is rotatable around the longitudinal axis of the insertion part, and which is formed at the tip part and has a tip. And a stiffening portion provided at the tip of the tapered portion and having a rigidity higher than that of the tip of the tapered portion.挿入装置用チューブは、被検体に挿入される挿入装置の挿入部の外周に配置され、前記挿入部の長手軸周りに回転可能な挿入装置用チューブであって、先端部に形成され、先端に向かって外径が小さくなるテーパ部と、前記テーパ部の先端に設けられ、前記テーパ部の先端よりも剛性が高い補剛部と、を具備する。
