A paper feeding device of an image forming device includes a flotation air blowing unit and a separation air blowing unit. The flotation air blowing unit floats stacked uppermost paper through air blowing. The separation air blowing unit blows an end of other paper floated together with the floated uppermost paper to separate the other paper from the uppermost paper, the end being on the downstream side in the paper feeding direction. The flotation air blowing unit floats an end of the stacked uppermost paper, the end being on the downstream side in the paper feeding direction. The paper feeding device includes a resistance force applying mechanism which applies resistance force that gives a load against movement along the paper feeding direction to an end of stacked upper paper, the end being on the upstream side in the paper feeding direction.