PROBLEM TO BE SOLVED: To provide a catheter which is hardly broken as a polymer sleeve raises the strength of an adjoining part itself (namely, a connecting part) of two tubes, since the strength near the boundary between the connecting part and the others, namely, around the connecting part, is not raised and therefore, the surrounding part of this connecting part is easily broken.SOLUTION: A connecting tube 13 rides over the outer wall of an own part from the inner wall of a tube-shaped balloon 11 to the inner wall of a distal tube 21, and connects the outer wall to their inner wall, to connect both tubes 11 and 21.
