A bill handling apparatus is provided with a deposit/withdrawal unit (2) positioned at the inner upper side of a casing (1), a base unit (3) positioned at the inner lower side of the casing (1), and intermediate units 4A to 4C arranged at one or more stages between the units (2) and (3). The deposit/withdrawal unit (2) includes a bill introducing mechanism (21), a bill discharging mechanism (23) and a conveying mechanism (29). The base unit (3) includes a bill storage section (31), a conveying mechanism (32) and a taking-in and taking-out mechanism (34). Each of the intermediate units (4A) to (4C) includes a bill storage section (41), a conveying mechanism (42), a taking-in and taking-out mechanism (44) and a switcher for switching a bill-moving direction. In this way, the elements forming the bill storage sections and transfer mechanisms are made common, the number of the bill storage sections can be easily increased or decreased by a necessary and minimum change, and bills can be taken in and out of each storage section.