Sheet feeding apparatus, image forming apparatus and image formation system

An image forming apparatus comprising:

• a sheet storage section including a sheet placement tray where a plurality of sheets are to be placed, the sheet storage section being configured to store the sheets;
• a conveyance belt located above the sheets placed on the sheet placement tray, the conveyance belt being configured to convey the sheets adhering in a sheet conveyance direction;
• a suction section provided at an inner side of the conveyance belt and configured to suction air to cause the sheets placed on the sheet placement tray to adhere to the conveyance belt;
• a displacement member provided at a position opposite to the suction section with the sheets placed in between when the sheets exist on the sheet placement tray or at a position opposite to the suction section when no sheet exists on the sheet placement tray, the displacement member being displaced in position in accordance with a suction force received from the suction section;
• a displacement detection section configured to detect displacement of the position of the displacement member;
• and
• a control section configured to detect the presence or absence of a sheet in the sheet storage section based on the detection result of the displacement detection section.