Patent ID: 7198266

Claim:
A sheet cassette comprising: a tray main body part; a tray expansion/contraction part supported by the tray main body part and configured to slide relative to the tray main body part to a cassette expanded position where the sheet cassette is in an expanded state and a cassette contracted position where the sheet cassette is in a contracted state, the tray expansion/contraction part comprising a rear end regulation member configured to be moved in a direction in which recording media stacked in the sheet cassette are fed to regulate rear ends of the recording media and a sliding guide part configured to support the rear end regulation member to freely slide and to form a moving path of the rear end regulation member; and an auxiliary member that is configured to be attached, when the tray expansion/contraction part is in the cassette expanded position, to the sliding guide part of the tray expansion/contraction part to extend a length of the moving path of the rear end regulation member of the tray expansion/contraction part between the tray expansion/contraction part and the tray main body part and is configured to be detached from the sliding guide part of the tray expansion/contraction part when the tray expansion/contraction part is in the cassette contracted position.