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； an insulating tube 12 which exposes an electrode area (exposed area Ae) while covering the periphery of the electrode needle 11 along the axial direction (Z-axis direction) of the electrode needle 11； a flow path 110 which is formed inside the electrode needle 11 and through which a liquid L for cooling flows； and a handle 13 fitted to the base end side of the electrode needle 11. The handle 13 includes: a handle body 130； an operation part 131； a liquid storage section 133 which is disposed inside the handle body 130 and temporarily stores the liquid L for cooling； and a slide mechanism 132 which is disposed inside the handle body 130 in parallel to the liquid storage section 133 and which performs a slide operation along the axial direction in conjunction with a prescribed operation of the operation part 131, thereby causing a slide operation of the insulating tube 12 along the axial direction.本發明提供一種可以提升便利性的消融裝置。消融裝置(1)，其具備：電極針(11)，對體內患部(90)經皮穿刺，並且被供給電力(Pout)；絕緣管(12)，使電極區域(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；流路(110)，形成在電極針(11)的內部，有冷卻用的液體(L)流動；以及手柄(13)，安裝在電極針(11)的基端側。手柄(13)具有：手柄主體(130)；操作部(131)；液體容納部(133)，配置在手柄主體(130)內，暫時容納冷卻用的液體(L)；以及滑動機構(132)，在手柄主體(130)內與液體容納部(133)並列配置，並且藉由與對操作部(131)進行的既定的操作聯動，沿著軸向滑動，藉以使絕緣管(12)沿著軸向滑動。
