An endoscope comprising: an operation section provided with an operating member; an insertion section that is provided on a distal end side of the operation section and that is inserted into a subject; a treatment tool erecting base provided at a distal end part of the insertion section; a movable member (96, 242) that is formed in a U-like shape and arranged to be exposed to outside of the operation section and that moves in association with an operation of the operating member; an erecting operation wire (60, 126) that is coupled to the treatment tool erecting base at a distal end side thereof, that is coupled to the movable member (96, 242) at a proximal end side thereof, and that is pushed/pulled in accordance with a movement of the movable member (96, 242) to move the treatment tool erecting base; and an attachment member (98,98A,212,234,244) that is provided at a proximal end of the erecting operation wire (60, 126) and that is engaged with the movable member (96, 242) in an attachable/detachable manner by a one-touch operation; wherein the movable member (96, 242) is provided rotatably around an axis perpendicular to an axial direction of the erecting operation wire (60, 126) and includes a flat-plate-shaped beam portion and two leg portions (162, 164), each leg portion (162, 164) being provided at a respective end of the beam portion; wherein an engagement hole is formed along the longitudinal direction of the beam portion; and wherein a pair of engagement portions of the attachment member are engaged with the engagement hole in an attachable/detachable manner by a one-touch operation. an operation section provided with an operating member; an insertion section that is provided on a distal end side of the operation section and that is inserted into a subject; a treatment tool erecting base provided at a distal end part of the insertion section; a movable member (96, 242) that is formed in a U-like shape and arranged to be exposed to outside of the operation section and that moves in association with an operation of the operating member; an erecting operation wire (60, 126) that is coupled to the treatment tool erecting base at a distal end side thereof, that is coupled to the movable member (96, 242) at a proximal end side thereof, and that is pushed/pulled in accordance with a movement of the movable member (96, 242) to move the treatment tool erecting base; and an attachment member (98,98A,212,234,244) that is provided at a proximal end of the erecting operation wire (60, 126) and that is engaged with the movable member (96, 242) in an attachable/detachable manner by a one-touch operation; wherein the movable member (96, 242) is provided rotatably around an axis perpendicular to an axial direction of the erecting operation wire (60, 126) and includes a flat-plate-shaped beam portion and two leg portions (162, 164), each leg portion (162, 164) being provided at a respective end of the beam portion; wherein an engagement hole is formed along the longitudinal direction of the beam portion; and wherein a pair of engagement portions of the attachment member are engaged with the engagement hole in an attachable/detachable manner by a one-touch operation.