a paper pick - up unit of an image forming apparatus includes an elliptical pick - up rubber having a first arcuate part and a second arcuate part . the first and second arcuate parts are symmetrical to each other and contact a paper . a pick - up housing supports the pick - up rubber , which are attached around the circumference thereof . a first shaft opening and a second shaft opening are formed opposite to each other in the pick - up housing and are eccentrically disposed with respect to a center of the pick - up housing . a pick - up shaft is engaged with one of the first shaft opening and the second shaft opening of the pick - up housing , and is capable of rotating . the pick - up shaft is engaged with the first shaft opening of the pick - up housing for the first arcuate part of the pick - up rubber to pick up a paper . the pick - up shaft is engaged with the second shaft opening of the pick - up housing for the second arcuate part of the pick - up rubber to pick up a paper .