A tube body 13 that extends through can be inserted conduit 13a the insertion portion 3 of the biliary mirror from the front end to the rear end, the medical tube of the present invention, is formed between the rear end from the distal end of the tube main body 13 a side hole 13b which communicates with the, and the conduit 13a and the outer circumferential surface of the insertion portion 3, in response to operation of the operator, capable of changing the hardness changing unit a hardness of at least a portion of the tube body 13 including a side hole 13b I and a 14.本発明による医療用チューブは、先端から後端まで胆道鏡1の挿入部3を挿通可能な管路13aが貫通されているチューブ本体13と、チューブ本体13の先端から後端の間において形成された、挿入部3の外周側面と管路13aとを連通する側孔13bと、操作者の操作に応じて、側孔13bを含むチューブ本体13の少なくとも一部の硬度を変更可能な硬度変更部14とを備える。
