To provide a stacking mechanism and an impeller capable of achieving excellent stacking of media by removing static electricity generated between the media and the impeller.

In the stacking mechanism, bank notes P are tapped by a rotatable impeller 9 having a plurality of flexible blade parts and stacked. The surface of the impeller 9 is plated to have the conductivity, and the impeller 9 is grounded to remove the static electricity caused by the contact of the impeller 9 with the banknotes P.