An endoscope treatment tool (1, 1A, 71, 81) comprising: a pair of forceps members (11, 12) supported so as to be relatively movable by a rotation shaft; an operation section for performing open/close operations of the pair of forceps members (11, 12); and an operation wire for connecting the pair of forceps members (11, 12) to the operation section, wherein the operation section includes: an operation section main body; a first operation member to which the operation wire is connected and which is slidably attached to the operation section main body, wherein by sliding the first operation member relative to the operation section main body, the pair of forceps members (11, 12) performs open/close operations via the operation wire; a second operation member which is attached to the first operation member so as to be capable of sliding relative to the first operation member; a force adjustment member which is attached to the second operation member, and restricts the second operation member to slide relative to the first operation member, wherein the force adjustment member is compressed in accordance with applying an amount of operation force which is larger than a predetermined force to the second operation member, thereby the second operation member is allowed to slide relative to the first operation member; and a force-retaining member which approaches to the operation section main body in accordance with the slide of the second operation member relative to the first operation member, wherein the first operation member is fixed to the operation section main body by the force-retaining member approaching to the operation section main body. a pair of forceps members (11, 12) supported so as to be relatively movable by a rotation shaft; an operation section for performing open/close operations of the pair of forceps members (11, 12); and an operation wire for connecting the pair of forceps members (11, 12) to the operation section, wherein the operation section includes: an operation section main body; a first operation member to which the operation wire is connected and which is slidably attached to the operation section main body, wherein by sliding the first operation member relative to the operation section main body, the pair of forceps members (11, 12) performs open/close operations via the operation wire; a second operation member which is attached to the first operation member so as to be capable of sliding relative to the first operation member; a force adjustment member which is attached to the second operation member, and restricts the second operation member to slide relative to the first operation member, wherein the force adjustment member is compressed in accordance with applying an amount of operation force which is larger than a predetermined force to the second operation member, thereby the second operation member is allowed to slide relative to the first operation member; and a force-retaining member which approaches to the operation section main body in accordance with the slide of the second operation member relative to the first operation member, wherein the first operation member is fixed to the operation section main body by the force-retaining member approaching to the operation section main body. an operation section main body; a first operation member to which the operation wire is connected and which is slidably attached to the operation section main body, wherein by sliding the first operation member relative to the operation section main body, the pair of forceps members (11, 12) performs open/close operations via the operation wire; a second operation member which is attached to the first operation member so as to be capable of sliding relative to the first operation member; a force adjustment member which is attached to the second operation member, and restricts the second operation member to slide relative to the first operation member, wherein the force adjustment member is compressed in accordance with applying an amount of operation force which is larger than a predetermined force to the second operation member, thereby the second operation member is allowed to slide relative to the first operation member; and a force-retaining member which approaches to the operation section main body in accordance with the slide of the second operation member relative to the first operation member, wherein the first operation member is fixed to the operation section main body by the force-retaining member approaching to the operation section main body.