[PROBLEMS] To provide a medical elongated body capable of smoothly and minimally invasively inserting and removing a medical elongated body into and out of a living body and capable of preventing inadvertent movement during use. provide. The outer surface of the sheath tube 110 has a hydrophilic lubricating coating layer 160 that exhibits lubricity when wet, and exhibits hydrophilicity and lubricity at a temperature lower than the critical temperature when wet, and is hydrophobic at a temperature higher than the critical temperature when wet. And a temperature-responsive lubricating coating layer 170 exhibiting the property of non-lubricity, and the temperature-responsive lubricating coating layer is disposed on the base end side of the hydrophilic lubricating coating layer, and the sheath tube It is formed on the base end side. [Selection] Figure 2【課題】生体内外への医療用長尺体の出し入れを円滑に低侵襲で行い得るとともに、使用している最中に不用意な移動が生じるのを防止することができる医療用長尺体を提供する。【解決手段】シースチューブ１１０の外表面には、湿潤時に潤滑性を示す親水性潤滑被覆層１６０と、湿潤時に臨界温度未満で親水性及び潤滑性を示し、かつ、湿潤時に臨界温度以上で疎水性及び非潤滑性を示す温度応答性潤滑被覆層１７０と、が形成されており、温度応答性潤滑被覆層は、親水性潤滑被覆層の基端側に配置されており、かつ、シースチューブの基端側に形成されている。【選択図】図２
