A method for producing a balloon catheter, comprising - an outer shaft having a distal end and a fluid line, - an inner shaft, which is arranged at least at the distal end of said outer shaft and which protrudes beyond the distal end of the outer shaft, and - a balloon, which can be dilated under the influence of a fluid introduced under pressure through the fluid line and which = is fastened at its proximal end in a fluid-tight manner to the distal end region of the outer shaft by means of a first fastening zone, = is fastened at its distal end in a fluid-tight manner to the distal end region of the inner shaft by means of a second fastening zone, and = between the fastening zones (14, 16), in the undilated state, is placed in longitudinal folds over its length, characterised by the following method steps: - producing a balloon blank having cones (10, 15) at its proximal and distal end (7, 8) from a plastically stretchable plastics tube by application of fluid pressure, wherein the ends of the tube are clamped in a holding device, whereupon the lumen is subjected to a fluid pressure, whereby the workpiece is inflated between the clamping points and the wall material is stretched, such that a cylindrical balloon is formed, - placing the balloon in longitudinal folds around the distal end (2, 4) of the outer and inner shaft (1,3), - cutting off the cones (10, 15) at the proximal and distal end (7, 8) of the balloon blank, and - welding the proximal and distal end (7, 8) of the balloon placed in longitudinal folds onto the outer and inner shaft (1, 3) of the catheter in a fluid-tight manner, the balloon being cone-free at its proximal and distal end (7, 8), with the same thin wall thickness (d) over its length, and the longitudinal folds extending into the fastening zone there. - an outer shaft having a distal end and a fluid line, - an inner shaft, which is arranged at least at the distal end of said outer shaft and which protrudes beyond the distal end of the outer shaft, and - a balloon, which can be dilated under the influence of a fluid introduced under pressure through the fluid line and which = is fastened at its proximal end in a fluid-tight manner to the distal end region of the outer shaft by means of a first fastening zone, = is fastened at its distal end in a fluid-tight manner to the distal end region of the inner shaft by means of a second fastening zone, and = between the fastening zones (14, 16), in the undilated state, is placed in longitudinal folds over its length, = is fastened at its proximal end in a fluid-tight manner to the distal end region of the outer shaft by means of a first fastening zone, = is fastened at its distal end in a fluid-tight manner to the distal end region of the inner shaft by means of a second fastening zone, and = between the fastening zones (14, 16), in the undilated state, is placed in longitudinal folds over its length, - producing a balloon blank having cones (10, 15) at its proximal and distal end (7, 8) from a plastically stretchable plastics tube by application of fluid pressure, wherein the ends of the tube are clamped in a holding device, whereupon the lumen is subjected to a fluid pressure, whereby the workpiece is inflated between the clamping points and the wall material is stretched, such that a cylindrical balloon is formed, - placing the balloon in longitudinal folds around the distal end (2, 4) of the outer and inner shaft (1,3), - cutting off the cones (10, 15) at the proximal and distal end (7, 8) of the balloon blank, and - welding the proximal and distal end (7, 8) of the balloon placed in longitudinal folds onto the outer and inner shaft (1, 3) of the catheter in a fluid-tight manner, the balloon being cone-free at its proximal and distal end (7, 8), with the same thin wall thickness (d) over its length, and the longitudinal folds extending into the fastening zone there.