An actuating member includes: a first movement member and a second movement member which are located at a proximal side of the elongated member and are configured to be relatively movable toward and away from each other along an axial direction of the elongated member; a push-pull member that includes a first connection portion configured to be connected to the first movement member, a first extension portion extending from the first connection portion toward a distal side in the axial direction of the elongated member, a second connection portion configured to be connected to the second movement member, and a second extension portion extending from the second connection portion toward the distal side in the axial direction of the elongated member; and an operation member configured to operate the movement of the first movement member and the second movement member.