The type and number of denomination of notes and the identification method of authentic notes differs for every country. The development of such identification device for these currencies in each country increases the manufacturing cost, and the processing time increases when the types of notes to be authenticated are increased. The present invention provides a paper sheet identifier device, which includes a main board for operating common processes independent from specific notes and sub-boards in parallel operation, allowing sub-boards connected to the main board to be added or replaced in accordance with the type and number of denomination of notes in a country along with the authentication method. The present invention improves the processing speed by parallelizing the identification processes, and the efficiency of updating the device specification when a new note is issued.