A binding tool including an elongated substrate; a pair of rotatable shafts rotatably
supported on both side portions of the substrate; a plurality of first and second raschig ring fixed on the shafts; and a slidable operation plate disposed along the shafts on a bottom surface of the substrate, movable in a longitudinal direction of the substrate and having a fingerhold on a front end thereof; wherein: each of the shafts is provided with a cam protrusion; the operation plate is provided with cam grooves receiving the cam protrusions, the cam grooves having an inclined path to rotate each of the shafts as the operation plate is moved in the longitudinal direction; when the operation plate is in a first end position, the shaft is rotated in one direction via the cam protrusion to separate the first binding rings from the second binding rings, and when the operation plate is in a second end position, the shaft isrotated in the opposite direction via the cam protrusion to engage the first raschig ring with the second binding rings; each of the shafts has an engagement plate protruding toward the operation plate on at least one portion along the longitudinaldirection;