PROBLEM TO BE SOLVED: To provide a balloon catheter capable of achieving both an improvement in expandability of a balloon by a support member and an improvement in passing performance of the balloon catheter by causing the support member provided inside the balloon to float without causing it to be fixed to other members.SOLUTION: In a balloon catheter 1, the expansion of a support member 40 is not inhibited by other members (e.g., a balloon 10, an outer shaft 20, and an inner shaft 30) when the support member 40 is expanded, and after the support member 40 is expanded, the support member 40 which is not bound by the other members (e.g., the balloon 10, the outer shaft 20, and the inner shaft 30) can firmly support the inner peripheral surface 14 of the balloon 10.SELECTED DRAWING: Figure 3【課題】バルーン内部に設けた支持部材を他の部材に固着させずに浮遊させることで、支持部材によるバルーンの拡張性能の向上と、バルーンカテーテルの通過性の向上と、を両立したバルーンカテーテルを提供する。【解決手段】バルーンカテーテル１では、支持部材４０が拡張する際、支持部材４０の拡張が他の部材（例えば、バルーン１０、アウターシャフト２０、インナーシャフト３０）により阻害されず、かつ、支持部材４０が拡張した後、他の部材（例えば、バルーン１０、アウターシャフト２０、インナーシャフト３０）に束縛されていない支持部材４０は、バルーン１０の内周面１４をしっかり支持することができる。【選択図】図３
