An object is to provide a defibrillation catheter that is insertable along a guide wire into a target site in the inside of a cardiac cavity and that can assuredly prevent a short circuit between a first lead wire group and a second lead wire group. The defibrillation catheter of the present invention comprises a multi-lumen tube 10, a first DC electrode group 31G, a second DC electrode group 32G, a first lead wire group 41G made up of lead wires 41 connected to each of constituent electrodes 31 of the first DC electrode group 31G, and a second lead wire group 42G made up of lead wires 42 connected to each of constituent electrodes 32 of the second DC electrode group 32G； and applies voltages between the first DC electrode group 31G and the second DC electrode group 32G. The multi-lumen tube 10 has a center lumen 10L through which the guide wire is insertable, and a sub-lumen 11L and a sub-lumen 12L disposed so as to face each other with the center lumen 10L interposed therebetween. The first lead wire group 41G extends in the sub-lumen 11L, and the second lead wire group 42G extends in the sub-lumen 12L.以提供一種能夠沿著導引鋼線來插入至心腔內之目標部位處並且能夠確實地防止第1引線群與第2引線群之間的短路之除顫導管一事，作為目的。本發明之除顫導管，係具備有多管腔管(10)、和第1DC電極群(31G)、和第2DC電極群(32G)、和由被與第1DC電極群(31G)之構成電極(31)的各者作了連接的引線(41)所成之第1引線群(41G)、和由被與第2DC電極群(32G)之構成電極(32)的各者作了連接的引線(42)所成之第2引線群(42G)，而構成之，並在第1DC電極群(31G)和第2DC電極群(32G)之間施加電壓，多管腔管(10)，係具備有能夠插通導引鋼線之中央管腔(10L)、和包夾此而被作了對向配置的副管腔(11L以及12L)，第1引線群(41G)係延伸存在於副管腔(11L)處，第2引線群(42G)係延伸存在於副管腔(12L)處。
