A paper-sheet handling device, as shown in FIG. 23, is a device that transports a bundle of paper-sheets obtained by binding a plurality of paper-sheets and is provided with a clamp movement mechanism 80 that contains lower arms 801a and upper arms 801b and transports the bundle of paper-sheets with it being fixed. The clamp movement mechanism 80 contains a clamp-opening-and-closing driving section 881 that drives the upper arms 801b, the clamp-opening-and-closing driving section 881 is provided with cams 87a, 87b, and each of the cams 87a, 87b contains a part having a given curved shape, the part keeping a normal operation range in which the upper arm 801b is moved up to a predetermined position with respect to the lower arm 801a to release the bundle of paper-sheets 3″ and a U-shaped part that keeps a lock position for opening the clamp, the U-shaped part being continuous with the part having the given curved shape. Such a configuration allows a situation in which the upper arms 801b are opened to be locked. This enables workability and operability when a jam removes to be improved and enables release of the lock of a manipulation lever to be prevented from being forgotten.