There is provided an image forming apparatus. In the image forming apparatus, a paper feeder is detachably installed in the image forming apparatus and feeds the paper to the image forming unit. The paper feeder comprises a first paper feed unit for feeding the paper to the image forming unit along a first paper passage and a second paper feed unit for feeding the paper to the image forming unit along a second paper passage. Also, the paper feeder comprises a guide surface that forms a portion of the paper passage. Therefore, jammed paper can be easily removed after pulling the paper feeder out of the image forming apparatus, thereby increasing the stability of the image forming apparatus and user's convenience. Further, jammed paper at the first paper passage and/or the second paper passage can be easily removed due to the integral form of the first and second feed unit.