Image reading device and image forming apparatus

An image reading device comprising:

• a document table on which a document is placed;
• a reading unit which is disposed below the document table and scans the placed document in a main-scanning direction to read an image;
• a reading unit moving part which moves the reading unit in a sub-scanning direction crossing the main-scanning direction and in an opposite direction to the reading direction;
• a cursor to which a reading start side edge of the document placed on the document table in the sub-scanning direction is abutted;
• and
• a cursor moving part which moves the cursor along the sub-scanning direction in a reciprocating manner, wherein
• the cursor moving part moves the cursor from a reference position of the reading unit in the opposite direction in conjunction with a movement of the reading unit from the home position in the opposite direction, so that an image readable range in the sub-scanning direction can be increased.