The project of the present invention is firmly concatenated catheter tube in the conduit leading end portion that provides suitable shape (posture), the seldom electrode catheter of the difference of the strength of connection between what product.The solution system of the present invention has catheter tube (11) and control handle and leading end portion coupling member (12) and conduit leading end portion (31-34)； Leading end portion coupling member (12),The leading end portion holding part (122) that the retaining hole (131-134) of the first end face of system's opening what convex surface shape is formed along axis direction,It is integrally shaped with cylindrical portion (121) system that the inner hole (135) for being connected to what retaining hole is formed along axis direction； The base end portion of conduit leading end portion (31-34),In the state for being inserted into retaining hole (131-134),The leading end portion holding part (122) of what leading end portion coupling member (12) is fused by heat,The cylindrical portion (121) of leading end portion coupling member (12) simultaneously,In the state for the inner hole for being inserted into catheter tube (11),What catheter tube (11) are fused by heat.本發明之課題在於提供合適的形狀(姿勢)之導管先端部對導管軟管堅固地被連結，於製品之間的連結強度的差異很少的電極導管。本發明之解決手段係具備導管軟管(11)與控制把手與先端部連結構件(12)與導管先端部(31-34)；先端部連結構件(12)，係開口於凸曲面狀的先端面之保持孔(131-134)沿著軸方向被形成的先端部保持部分(122)，與連通於保持孔的內孔(135)沿著軸方向被形成的圓筒狀部分(121)係一體地被成形；導管先端部(31-34)的基端部分，在被插入保持孔(131-134)的狀態，被熱融接於先端部連結構件(12)的先端部保持部分(122)，同時先端部連結構件(12)之圓筒狀部分(121)，在被插入導管軟管(11)的內孔的狀態，被熱融接於導管軟管(11)。
