A multi-function peripheral including: a printing portion; a scanning portion reading an image from a document; a discharge portion disposed between the printing portion and the scanning portion, and loading sheets of print media on which images are formed; and a finisher installed on the discharge portion to post-process the print media, on which the image is formed. The finisher includes: a plurality of fixing units including a first fixing portion disposed on a lower portion of the finisher in order to prevent the finisher from moving upward and a second fixing portion that can rotate so as to prevent the finisher from moving in an attaching direction on the discharge portion.