PURPOSE: A multistage file case having a reading desk function is provided to prevent the bending of documents when storing and carrying the documents by integrating first and second covers. CONSTITUTION: A multistage file case includes a supporting sheet, a first cover sheet, and a second cover sheet. The first cover sheet is foldably integrated to one side of the supporting sheet. The second cover sheet is foldably integrated to the other side of the supporting sheet. A concave groove is formed on the lower outside of the first cover sheet.
