A balloon catheter has an inner tube having a first lumen, an outer tube part coaxial with the inner tube and forming a second lumen between the outer tube part and an outer surface of the inner tube, and a balloon part having a front end portion fixed to a front end portion of the inner tube and an inside communicating with the second lumen. The balloon part has a bulged portion, having an expansion forming mode formed in advance, which is elastically deformable beyond the expansion forming mode by an expansion liquid injected thereinto. The outer tube part has a front side sleeve portion extending from a rear end portion of the bulged portion of the balloon part to a proximal end of the outer tube part, integrally formed with the balloon part using the same material as that of the balloon part, and substantially non-expandable.
