The purpose of the present invention is to provide a balloon-type electrode catheter that makes it possible to cauterize lesions over a wide area and that achieves excellent cooling effects for the inside of a balloon. This balloon-type electrode catheter comprises: an outer tube 10； an energization connector 21； a balloon 30 that has a neck part 33, 35 at either end of an expanding part 31； an inner tube 41； a distal-end tip 46； strip electrodes 51-54 that are formed on an outer surface of the balloon 30； and a conducting wire 70 that connects the energization connector 21 and each of the strip electrodes 51-54. The openings of fluid supply sub-lumens 101L-105L of the outer tube 10 are positioned further to the distal-end side than the axial-direction middle of the expanding part 31 of the balloon 30, and the openings of fluid discharge sub-lumens 107L-109L of the outer tube 10 are positioned at a base end of the expanding part 31.本發明的目的，是在於提供一種氣球型電極導管，其對於病灶能夠及於大範圍地進行燒灼治療，且對於氣球內部具有優秀的冷卻效果。本發明的氣球型電極導管，具備有：外管(10)、及通電用連接器(21)、及氣球(30)，其在擴張部(31)的兩端具有頸部(33)、(35)、及內管(41)、及前端頂件(46)、及帶狀電極(51～54)，其形成於氣球(30)的外表面、及導線(70)，其將帶狀電極(51～54)之各個與通電用連接器(21)連接；外管(10)的流體供給用副腔(101L～105L)的開口，是位在比氣球(30)之擴張部(31)的軸向的中間位置更靠近前端側，外管(10)的流體排出用副腔(107L～109L、111L)的開口，是位在擴張部(31)的基端。
