A balloon catheter (1) has an inner tube (3) having a first lumen (11), an outer tube part (2) provided coaxially with the inner tube (3) and forming a second lumen between the outer tube part and an outer surface of the inner tube, and a balloon part (4), a front end portion of which is fixed to a front end portion of the inner tube (3) and an inside of which communicates with the second lumen (12). The balloon part (4) has a bulged portion (40), having an expansion forming mode formed in advance, which is elastically deformable beyond the expansion forming mode by a balloon expansion liquid injected thereinto. The outer tube part (2) has a front side sleeve portion (21) which is extended from a rear end portion of the bulged portion (40) of the balloon part (4) to a proximal end of the outer tube part, is formed integrally with the balloon part (4) by using the same material as that to be used for the balloon part (4), and is substantially non-expandable.
