A paper-sheet-handling apparatus that that performs a binding processing on a bundle of paper-sheets by passing a spiral coil through plural holes for binding which are perforated on predetermined portions of each of the paper-sheets, the bundle of paper-sheets bundling the paper-sheets, the apparatus being provided with: a rotating guide part that is movable, and guides the spiral coil to feed it toward a coil advance direction; a first screw guide part that is movable and guides and conducts a forward end of the spiral coil fed by the rotating guide part toward the coil advance direction into the holes of the bundle of paper-sheets; and a control part that selects one diameter of the coil from plural diameters of the coil previously set, receives it as diameter-of-coil-setting information for setting a diameter of a coil of the spiral coil and controls positions of the rotating guide part and the first screw guide part, based on the diameter-of-coil-setting information; and a paper-sheet-mounting base that mounts the bundle of paper-sheets, characterized in that the apparatus comprises: a coil forming mechanism that forms the spiral coil; when a portion of the bundle of paper-sheets, on which the holes are perforated, is a forward end portion of the paper-sheet and a portion of the bundle of paper-sheets, which faces perpendicular to the forward end portion, is a side end portion thereof, the apparatus is provided with a first paper-sheet-aligning section that limits each of the paper-sheets in the bundle of paper-sheets mounted on the paper-sheet-mounting base to align the forward end portion thereof; and a second paper-sheet-aligning section that limits each of the paper-sheets in the bundle of paper-sheets limited by the first paper-sheet-aligning section and mounted on the paper-sheet-mounting base to align the side end portion thereof, wherein the second paper-sheet-aligning section includes a paper-sheet-aligning surface having a predetermined inclination with respect to a paper-sheet-mounting surface of the paper-sheet-mounting base and limits the side end portion of the bundle of paper-sheets obliquely along the inclination of the paper-sheet-aligning surface, and wherein when an angle θ consisting of the paper-sheet-mounting surface of the paper-sheet-mounting base and the paper-sheet-aligning surface is an inclination angle, the inclination angle is set to meet an inclination of the forward end of the spiral coil when the spiral coil advances through the holes of the bundle of paper-sheets, and the coil forming mechanism is operable to form the spiral coil having the diameter of coil selected by the control part and the rotating guide part is operable to guide the spiral coil passed through the holes of the bundle of paper sheets to feed it toward a coil advance direction. a rotating guide part that is movable, and guides the spiral coil to feed it toward a coil advance direction; a first screw guide part that is movable and guides and conducts a forward end of the spiral coil fed by the rotating guide part toward the coil advance direction into the holes of the bundle of paper-sheets; and a control part that selects one diameter of the coil from plural diameters of the coil previously set, receives it as diameter-of-coil-setting information for setting a diameter of a coil of the spiral coil and controls positions of the rotating guide part and the first screw guide part, based on the diameter-of-coil-setting information; and a paper-sheet-mounting base that mounts the bundle of paper-sheets, a coil forming mechanism that forms the spiral coil; when a portion of the bundle of paper-sheets, on which the holes are perforated, is a forward end portion of the paper-sheet and a portion of the bundle of paper-sheets, which faces perpendicular to the forward end portion, is a side end portion thereof, the apparatus is provided with a first paper-sheet-aligning section that limits each of the paper-sheets in the bundle of paper-sheets mounted on the paper-sheet-mounting base to align the forward end portion thereof; and a second paper-sheet-aligning section that limits each of the paper-sheets in the bundle of paper-sheets limited by the first paper-sheet-aligning section and mounted on the paper-sheet-mounting base to align the side end portion thereof, wherein the second paper-sheet-aligning section includes a paper-sheet-aligning surface having a predetermined inclination with respect to a paper-sheet-mounting surface of the paper-sheet-mounting base and limits the side end portion of the bundle of paper-sheets obliquely along the inclination of the paper-sheet-aligning surface, and wherein when an angle θ consisting of the paper-sheet-mounting surface of the paper-sheet-mounting base and the paper-sheet-aligning surface is an inclination angle, the inclination angle is set to meet an inclination of the forward end of the spiral coil when the spiral coil advances through the holes of the bundle of paper-sheets, and the coil forming mechanism is operable to form the spiral coil having the diameter of coil selected by the control part and the rotating guide part is operable to guide the spiral coil passed through the holes of the bundle of paper sheets to feed it toward a coil advance direction.