A microstrip-to-microstrip RF transition circuit that employs a wide microstrip line transition to a short co-planar waveguide section. A document-type determining unit determines what type of document a document is on the basis of read information obtained as a result of reading the document by using a document reader. The sealing member includes a second portion that is adapted to restrict rotational movement in a third axis perpendicular to both of the at least two perpendicular axes. An outer diameter of the distal segment is greater than that of the proximal segment. The first, second and third attachment points are spaced apart to avoid interference between the self-piercing rivets or the clinch joints. With the configuration, an erroneous operation of the refresh executing circuit can be prevented.