An image forming apparatus that forms an image on a recording paper fed from a paper cassette, the apparatus comprises: a housing that accommodates the paper cassette to be drawn toward the front side of the housing and has an opening in the side surface of the housing; and a lid body including a covering part and a sliding part that slidably supports the covering part, the covering part having a member that covers the opening of the side surface of the housing and projects toward the inner side than the opening, the covering part and the sliding part integrally separating from the opening, and the covering part sliding in parallel to the opening.