The purpose of the present invention is to provide a balloon-type ablation catheter that can form a region reaching deep into myocardial tissue, is unlikely to result in the formation of clots near the surface of the balloon during surgery, and does not cause a healthy part of the heart to be cauterized after coming into contact with the surface of the balloon. This balloon-type ablation catheter is provided with: a catheter shaft (10) comprising a multi-lumen tube a tip tube (30) fitted to the tip of the catheter shaft (10) a conducting wire (35) of the tip tube (30) a balloon (50) fitted so as to contain the tip portion of the catheter shaft (10) a balloon surface electrode (70) that is formed from a metal thin film formed on the tip-side outer surface of the balloon (50), wherein a high-frequency current is applied between the balloon surface electrode (70) and a return electrode and a conducting wire (75) of the balloon surface electrode (70). Multiple through-holes (90) for irrigation are formed in the region where the balloon surface electrode (70) is formed.提供一種氣囊型消融導管,係可在心肌組織的深部形成燒灼區,且手術中難以在氣囊的表面附近形成血栓,即使氣囊的表面與心臓的健康部位接觸亦不會將其燒灼。具備:由多內腔管所成的導管軸10;安裝於其前端的前端細管30;前端細管30的導線35;安裝成將導管軸10的前端部分予以內包的氣囊50;由形成於氣囊50之前端側之外表面的金屬薄膜所成且在對極板之間流通高頻電流的氣囊表面電極70;及氣囊表面電極70的導線75,於氣囊表面電極70的形成領域形成有多數個灌注用貫通孔90。100‧‧‧消融導管10‧‧‧導管軸30‧‧‧前端細管31‧‧‧導引纜線內腔32‧‧‧側孔50‧‧‧氣囊55‧‧‧最大徑部70‧‧‧氣囊表面電極90‧‧‧灌注用貫通孔150‧‧‧電極導管151‧‧‧導管前端部
