Disclosed herein is a banknote handling apparatus 100 including a bundling stacker 4 configured to stack banknotes B therein. The bundling stacker 4 includes: a stage 41 configured to support the banknotes B in their thickness direction; and a guide 42 facing one side of the banknotes B and configured to regulate movement of the banknotes B in a predetermined regulation direction which is parallel to a surface of the banknotes B. The guide 42 moves such that while the banknotes B are removed from the bundling stacker 4, a gap G is formed in the regulation direction between the guide 42 and the one side of the banknotes B.