[Problem] The present invention provides a balloon catheter improved in fixing strength between a balloon and an outer shaft without increasing an outer diameter of a fixing part between the balloon and the outer shaft. [Solution] In a balloon catheter 1, an inner projection 72 of a balloon 10 is disposed in a gap 81 of an outer shaft 20, and an outer projection 80 of the outer shaft 20 is disposed in a gap 71 of the balloon 10. A proximal end 12 of the balloon 10 and a distal end 21 of the outer shaft 20 are engaged with each other, whereby a fixing area between the balloon 10 and the outer shaft 20 can be expanded easily, and it is possible to improve the fixing strength between the balloon 10 and the outer shaft 20 without increasing an outer diameter at a fixing part 14 between the balloon 10 and the outer shaft 20.
