Disclosed herein are a paper feeding device and an image forming apparatus capable a convenient removal a paper jammed between a pickup unit and a multi-sheet feeding prevention unit. The multi-sheet feeding prevention unit may be moveable in cooperation with a detachable paper cassette such that the multi-sheet feeding prevention member supported on the moveable multi-sheet feeding prevention unit moves toward and away from the pickup unit so that the pressing force between the pickup unit and the multi-sheet feeding prevention unit may be released to allow the jammed paper to be removed.