Paper-feeding device of image forming apparatus and image forming apparatus using the same

A paper-feeding device of an image forming apparatus and an image forming apparatus having the same include a paper-feeding cassette detachably mounted to a mounting section of a paper-feeding cassette in a body of the image forming apparatus, including a loading portion with plural sheets of paper and a front panel connected to the loading portion by a sliding member, a pick-up device provided at one side of the mounting section of the paper-feeding cassette, a pick-up bracket rotatably connected to a frame at an upper side of the mounting section and rotating around a rotating shaft, with one end of the pick-up bracket being connected to the pick-up device, and a pick-up controller operating in cooperation with the front panel when the paper-feeding cassette is mounted and removed to and from the mounting section, respectively.