Abstract: In a banknote handling device, a banknote storage cassette is loaded along guide grooves in left and right side plates, whereby the bottom end of a bill press interlocks with protruding members of the banknote storage cassette, preventing the banknote storage cassette from exiting the guide grooves, and, by sliding a lid of the banknote storage cassette, accumulated banknotes which are stored therein are transferred to a mounting plate while a free-sliding plate member inside a storage space of the banknote storage cassette presses the accumulated banknotes downward, the accumulated banknotes being separated one by one and conveyed down a transport path by a kick-out roller, a feeding roller, and a separating roller.