A device for inserting bank notes into a bank note processing device. The bank note processing device has a main body, a support surface for supporting a bank note to be inserted on a flat side, and at least one lateral positioning edge for laterally positioning the slot on the bank note processing device and/or for connecting the slot to the bank processing device in an accurately fitting manner. The device for inserting bank notes into a bank note processing device is characterized by a setting mechanism for variably setting the position of the positioning edge transversely to the insertion direction of the bank note through the slot.