| 摘要 |
At least one section of non-bendable straight tube portion includes longitudinal movement restriction protrusions which are provided to protrude from an outer peripheral surface of the non-bendable straight tube portion and are provided with an interval which is equal to a width of a fixing member. In addition, the non-bendable straight tube portion further includes a peripheral movement restriction protrusion provided to protrude from the outer peripheral surface to linearly extend from one end to the other end of the non-bendable straight tube portion along the longitudinal direction of the non-bendable straight tube portion in order to restrict movement of the fixing member in a peripheral direction with respect to the non-bendable straight tube portion. |
