An image reading apparatus includes a scanning module reading an image of a document while sliding, a guide module guiding the scanning module to slide along an axis, and a drive module including first and second timing belts respectively coupled to both ends of the scanning module, first and second belt pulleys having teeth for respectively circulating the first and second timing belts, a connection shaft coaxially connecting the first and second belt pulleys, a drive motor, and a gear train, as a driving force transfer member, directly connecting the drive motor and the first belt pulley.