The purpose of the present invention is to provide a balloon catheter which can be very easily inserted through a blood vessel portion, can reliably hold a distal end tip even if an inner tube and the distal end tip cannot be welded together, and is configured so that a kink will not occur on the distal end side of a balloon. A balloon catheter is provided with an outer tube 10, a balloon 30, an inner tube 40, and a distal end tip 50, and the distal end neck section 32 of the balloon 30 has: a proximal end section 321 having a first outer diameter D1 and a first inner diameter d1 a distal end section 322 having a second inner diameter d2 smaller than the first inner diameter and a stepped section 323 formed at the boundary between the proximal end section and the distal end section. The distal end section 42 of the inner tube 40 is affixed to the proximal end section 321 of the distal end neck section 32 by adhering to each other the outer peripheral surface 426 of the distal end section 42 and the inner peripheral surface 327 of the proximal end section 321 of the distal end neck section 32 while the distal end surface 425 of the distal end section 42 and the stepped section 323 of the distal end neck section 32 are adhered to each other, and the proximal end section 51 of the distal end tip 50 is affixed by welding to the distal end section 322 of the distal end neck section 32.提供一種氣球導管,其係對於血管部位之插通性優異,且即使內管與前端細管無法彼此熔接,亦能夠確實保持前端細管,使氣球的前端側不致發生扭結。具備外管(10)、氣球(30)、內管(40)、前端細管(50),氣球(30)的前端側頸部(32),係具有:基端部(321),係具有第1外徑(D1)及第1內徑(d1);前端部(322),係具有比第1內徑更小的第2內徑(d2)。階差部(323),係形成於基端部與前端部的邊界;內管(40)的前端部(42),係在其前端面(425)與前端側頸部(32)的階差部(323)受到接著的狀態下,其外周面(426)與前端側頸部(32)的基端部(321)的內周面(327)受到接著,藉此固定於前端側頸部(32)的基端部(321),且前端細管(50)的基端部(51)係被熔接固定於前端側頸部(32)的前端部(322)。30‧‧‧氣球32‧‧‧前端側頸部33‧‧‧氣球部40‧‧‧內管42‧‧‧內管的前端部50‧‧‧前端細管51‧‧‧前端細管的基端部52‧‧‧前端細管的前端部321‧‧‧前端側頸部的基端部322‧‧‧前端側頸部的前端部323‧‧‧前端側頸部的階差部326‧‧‧前端側頸部的前端部的外周面327‧‧‧前端側頸部的基端部的內周面425‧‧‧內管的前端部的前端面426‧‧‧內管的前端部的外周面511‧‧‧推拔部分512‧‧‧筆直部分517‧‧‧前端細管的基端部的內周面
