Image reading apparatus with movable reading unit

An image reading apparatus comprising:

• a reading unit which extends in a main scanning direction, and is movable in an auxiliary scanning direction intersecting with the main scanning direction;
• and
• a moving mechanism which moves the reading unit,
• wherein the moving mechanism includes a driving pulley which is driven by a power source, a plurality of driven pulleys which are rotatably driven, an endless belt which is engaged and rotates between the driving pulley and the plurality of driven pulleys, and attracts the reading unit, and a biasing unit which applies tension to the endless belt,
• wherein, in the endless belt, an attraction section of a belt section that extends along the auxiliary scanning direction, and which attracts the reading unit, is formed between a first driven pulley and a second driven pulley,
• wherein the driving pulley is provided at a position separated from the attraction section in the main scanning direction,
• wherein a biasing force of the biasing unit is applied to the belt section excluding the attraction section in the endless belt, and
• wherein the biasing unit and the belt section excluding the attraction section in the endless belt are located between a first one of the plurality of driven pulleys and the driving pulley.