A treatment instrument for endoscope (51; 81) comprising: a pair of forceps members (61, 62; 61, 91) being supported by a forceps rotation axis (65; 94) so as to be capable of rotating relative to each other, wherein at least one of the pair of forceps members (61, 62; 61, 91) comprises a conductive electrode part (63; 92) and an insulation part of insulation (64; 93); an operation part configured to open and close the pair of forceps members (61, 62; 61, 91); an operation wire connecting the pair of forceps members (61, 62; 61, 91) with the operation part; a link mechanism comprising: a connection member being provided on a distal end of the operation wire; a pair of link members (35, 36), first ends thereof being connected with proximal ends of each of the pair of forceps members (61, 62; 61, 91) so as to be capable of rotating; and a restriction wire functioning as a power supply wire comprising a first end and a second end, the first end being configured to be electrically connected with the electrode part (63; 63, 92) and the second end being configured to be capable of being connected with a power source so that the power supply wire is capable of supplying high frequency current to the electrode part (63; 63, 92), characterized in that the connection member comprises two link rotation axes (34A, 34B) having axis lines disposed in parallel to each other and separating from an axis line of the operation wire; second ends of the pair of link members (35, 36) are connected with each of the two link rotation axes (34A, 34B) so as to be capable of rotating, wherein the pair of link members (35, 36) are parallel in the state where the pair of forceps members (61, 62; 61, 91) are closed; and the power supply wire and the pair of link members (35, 36) are disposed so as not to overlap when viewing from an axis line direction of the link rotation axis (34A, 34B), wherein the restriction wire (71; 71A, 71B) has a distal end connected to the forceps rotation axis (65; 94), wherein the restriction wire is configured to guide the advance/retraction of a link mechanism. a pair of forceps members (61, 62; 61, 91) being supported by a forceps rotation axis (65; 94) so as to be capable of rotating relative to each other, wherein at least one of the pair of forceps members (61, 62; 61, 91) comprises a conductive electrode part (63; 92) and an insulation part of insulation (64; 93); an operation part configured to open and close the pair of forceps members (61, 62; 61, 91); an operation wire connecting the pair of forceps members (61, 62; 61, 91) with the operation part; a link mechanism comprising: a connection member being provided on a distal end of the operation wire; a pair of link members (35, 36), first ends thereof being connected with proximal ends of each of the pair of forceps members (61, 62; 61, 91) so as to be capable of rotating; and a restriction wire functioning as a power supply wire comprising a first end and a second end, the first end being configured to be electrically connected with the electrode part (63; 63, 92) and the second end being configured to be capable of being connected with a power source so that the power supply wire is capable of supplying high frequency current to the electrode part (63; 63, 92), a connection member being provided on a distal end of the operation wire; a pair of link members (35, 36), first ends thereof being connected with proximal ends of each of the pair of forceps members (61, 62; 61, 91) so as to be capable of rotating; and a restriction wire functioning as a power supply wire comprising a first end and a second end, the first end being configured to be electrically connected with the electrode part (63; 63, 92) and the second end being configured to be capable of being connected with a power source so that the power supply wire is capable of supplying high frequency current to the electrode part (63; 63, 92), characterized in that the connection member comprises two link rotation axes (34A, 34B) having axis lines disposed in parallel to each other and separating from an axis line of the operation wire; second ends of the pair of link members (35, 36) are connected with each of the two link rotation axes (34A, 34B) so as to be capable of rotating, wherein the pair of link members (35, 36) are parallel in the state where the pair of forceps members (61, 62; 61, 91) are closed; and the power supply wire and the pair of link members (35, 36) are disposed so as not to overlap when viewing from an axis line direction of the link rotation axis (34A, 34B), wherein the restriction wire (71; 71A, 71B) has a distal end connected to the forceps rotation axis (65; 94), wherein the restriction wire is configured to guide the advance/retraction of a link mechanism.