There is disclosed an image reading device, comprises a stacking section for stacking a document, a reading section for reading an image of the document, a separating section for separating the document stacked on the stacking section sheet by sheet, a conveying section for conveying the document separated by the separating section to the reading section and a discharging section for discharging the document to the outside of the device. In the device, sheet separating performance is enhanced. Additionally, the device body is reduced in cost and size, excellent reading operation can constantly be realized, and device assembling property is enhanced.