An image forming apparatus includes an image forming unit to form an image on a printable medium; a casing to accommodate the image forming unit; a feeding cassette coupled to the casing and arranged so as to move between a feeding position where the feeding cassette is separated from the casing and used to store the printable medium and a waiting position where the feeding cassette is folded up against the casing; a main feeding unit arranged within the casing to store another printable medium and to supply the another printable medium to the image forming unit; a pick-up roller to feed the printable medium from the feeding cassette to the image forming unit when the feeding cassette is in the feeding position; and a pick-up roller cover coupled to a main feeding unit so that the pick-up roller cover can rotate between an open position and a closed position.