An image scanning device includes a housing, a scanning unit disposed inside the housing and configured to scan, at a scanning position, an image of a sheet, a conveying mechanism disposed inside the housing, and a cover. The conveying mechanism is configured to convey the sheet along a common path to the scanning position in a first direction, and to discharge the sheet having passed the scanning position selectively along a return path in a second direction and along a one-way path in the first direction. The cover is configured to receive the sheet discharged from the one-way path in an inclined position in which the cover extends upward from the one-way path and is inclined relative to the one-way path.