Sheet feeding device and image forming apparatus

A sheet feeding device includes a stacking unit configured to allow sheets to be stacked thereon; side end regulating members configured to make contact with both side ends of the stacked sheets so that positions of the side ends are regulated; a feeding unit configured to feed one sheet at a time from the stacked sheets; an air supply unit; and an air blow unit including a blow port from which air supplied from the air supply unit is blown against a side end of the stacked sheets, the air blow unit being housed in each of the side end regulating members. Each side end regulating member has an opening for exhausting the air that is blown from the blow port unit to the stacked sheets. An orientation of the blow port is adjustable about an axial line perpendicular to a plane corresponding to a surface of the stacked sheets.