A paper feeding device for feeding a sheet of printing paper to a printing position of a printing apparatus in order to print the paper is disclosed. The paper feeding device includes a paper tray that stores plural sheets of the paper, a transport unit that transports the paper from the paper tray to the printing position, a guide unit that is provided to adjust a guide width in accordance with the width of the paper which is substantially perpendicular to a feeding direction of the paper transported by the transport unit, and to guide the paper which is transported from the paper tray by the transport unit.