A balloon catheter includes a proximal shaft, a distal shaft, an intermediate shaft positioned between the proximal shaft and the distal shaft, lumens that penetrate through the proximal shaft, the intermediate shaft, and the distal shaft and introduce and discharge a dilation fluid for a balloon, an inner tube shaft having a guide wire opening arranged at a boundary between the intermediate shaft and the distal shaft and through which the lumen extends, and a reinforcement member arranged in the lumen so as to suppress an occurrence of a kink. The reinforcement member has a tapered proximal portion fixed to the proximal shaft and arranged inside the lumen positioned in the intermediate shaft, a tapered distal portion arranged inside the lumen positioned in the distal shaft, and a straight transition portion positioned between the proximal portion and the distal portion. The transition portion is aligned with the guide wire opening.
