PROBLEM TO BE SOLVED: To provide a catheter which can improve flexibility of a baloon reinforced with a reinforcing member.SOLUTION: A baloon 14 of a catheter 10 has an internal layer 24 and an external layer 26 with elastic stretchability. A reinforcing member 28 like a cylindrical net is arranged between the internal layer 24 and the external layer 26. The reinforcing member 28 has an axial first end 31 and an axial second end 32, and an intermediate part 34 constituting a gap between the first end 31 and the second end 32. At least one of the first end 31 and the second end 32, and the intermediate part 34 are not fixed for the internal layer 24 and the external layer 26 directly.SELECTED DRAWING: Figure 2