Document sheet conveying device capable of achieving large capacity of sheet feed tray

A document sheet conveying device comprising:

• a sheet feed tray on which a document sheet is stacked;
• a sheet feed mechanism configured to feed, in a predetermined sheet feed direction, the document sheet stacked on the sheet feed tray;
• a sheet feed tray lift mechanism configured to lift up and down the sheet feed tray;
• a top plate portion which is adjacent to the sheet feed tray at a downstream side, in the sheet feed direction, of the sheet feed tray, is contacted by a lower surface of the document sheet having been fed, and guides the document sheet in the sheet feed direction, a part of the sheet feed mechanism being disposed at the top plate portion;
• a fixed wall portion provided to extend downward from an upstream end, in the sheet feed direction, of the top plate portion;
• and
• a lifted wall portion provided to face the fixed wall portion and configured to be lifted up and down along the fixed wall portion together with the sheet feed tray, wherein
• the fixed wall portion includes:
• a plurality of projection portions that are provided in a width direction crossing the sheet feed direction with intervals therebetween, project toward the sheet feed tray, and respectively have hollow portions whose lower end portions are open;
• and
• a plurality of recessed portions that are arranged alternately with the plurality of projection portions, and
• the lifted wall portion includes:
• a plurality of projection fitting portions that are respectively fitted in the hollow portions of the plurality of projection portions;
• and
• a plurality of recessed fitting portions that are respectively fitted in the plurality of recessed portions.