A balloon catheter is provided with: an outer shaft (10) a balloon (20) an inner shaft (30) which is provided with an inner layer (31) not capable of being thermally bonded to the outer shaft (10) and which is also provided with an outer layer (32) capable of being thermally bonded to the outer shaft (10), the inner shaft (30) being inserted through the inside of the outer shaft (10) to form a guide wire lumen (30L), the inner shaft (30) having a distal end which opens as a guide wire port (35) and a connection tube (40) which consists of a resin capable of being thermally bonded to the outer shaft (10) and to the outer layer (32) of the inner shaft (30), the connection tube (40) being connected to the proximal end side of the inner shaft (30) to form the guide wire lumen (30L), the connection tube (40) having a proximal end which opens as a guide wire port (45). The balloon catheter is configured so that a reduction in the wall thickness of the inner shaft is capable of being suppressed or prevented during the production (thermal bonding step) of the balloon catheter and so that the jamming of a guide wire is capable of being prevented during the use (when expanding the balloon) of the balloon catheter.氣球導管,係具備:外管軸(10)、氣球(20)、內管軸(30)、以及連接管(40);該內管軸(30),係具備:無法與外管軸(10)熔著之內層(31)以及可與外管軸(10)熔著之外層(32),並且被插通於外管軸(10)的內部而形成導引線管腔(30L),該前端作為導引線埠(35)而呈開口;該連接管(40),是由可熔著於外管軸(10)及內管軸(30)的外層(32)之樹脂所構成,且被連接於內管軸(30)的基端側,並形成導引線管腔(30L),該基端作為導引線埠(45)而呈開口。根據該氣球導管,於其製造時(熔著步驟),可抑制並防止內管軸之壁厚的減少,於其使用時(氣球的擴張時),可防止導引線的堆疊。10‧‧‧外管軸10L‧‧‧擴張管腔30‧‧‧內管軸30L‧‧‧導引線管腔31‧‧‧內層32‧‧‧外層40‧‧‧連接管45‧‧‧導引線埠80‧‧‧芯線
