A paper feeding device includes a guide member that guides both sides of a sheet of paper stacked in a paper feeding cassette and a support unit that prevents the guide members from being moved due to inertia of sheets of paper during installation of the paper feeding cassette. Accordingly, the paper feeding device contacts and supports one side of the guide unit and prevents the guide unit from being moved. Therefore, a sheet of paper may prevented from being separated from a finger during installation of the paper feeding cassette. Furthermore, a paper jam or skew due to the separation of the paper may be prevented.