Patent ID: 7448614

Claim:
A sheet feeding device comprising: a sheet storing portion which stores a plurality of sheets; a sheet tray which is vertically movably arranged in the sheet storing portion and which can support a plurality of sheets on a sheet placing surface; a side regulating member which is arranged such that the side regulating member can be freely moved in a notched portion formed in the sheet placing surface in the sheet width direction and which regulates side edges of sheets supported by the sheet tray; an auxiliary tray which is swingably arranged on the sheet tray and which constitutes a sheet placing surface which supports the sheets in the notched portion; a cutout portion which is formed in the side regulating member into which the auxiliary tray is movably inserted; and a contact portion which is brought into contact with the auxiliary tray at a predetermined level to swing the auxiliary tray downward when the sheet tray moves upward.