Provided is an ablation device which can improve convenience. An ablation device 1 comprises: an electrode needle 11 which percutaneously punctures an affected part 90 inside a body, and which is supplied with electric power Pout for performing ablation； an insulating tube 12 which exposes an electrode area (exposure area Ae) located on the tip end side of the electrode needle 11 while covering the periphery of the electrode needle 11 along the axial direction (Z-axis direction) of the electrode needle 11； and a handle 13 fitted to the base end side of the electrode needle 11. The insulating tube 12 has, in a partial region along the axial direction, a high resistance area 12H where friction resistance is relatively high.本發明提供一種能夠提高便利性的消融裝置。消融裝置(1)具備：電極針(11)，對體內患部(90)經皮穿刺，並且被供給用於進行消融的功率(Pout)；絕緣管(12)，使位於該電極針(11)的前端側的電極區域(露出區域Ae)露出，並且沿著電極針(11)的軸向(Z軸方向)覆蓋電極針(11)的周圍；以及手柄(13)，安裝在電極針(11)的基端側。絕緣管(12)在沿著上述軸向的一部分區域具有摩擦阻力相對高的高阻區域(12H)。
