An image scanning device includes a scanning unit configured to scan, at a scanning position, an image of a document, a first discharge portion, a second discharge portion, a conveying unit configured to selectively convey the document along a first conveying path from the scanning position to the first discharge portion, and along a second conveying path from the scanning position to the second discharge portion, a driving unit configured to generate a driving force for driving the conveying unit, and a path switching unit configured to receive the driving force generated by the driving unit such that the path switching unit moves between a first position for guiding the document toward the first discharge portion, and a second position for guiding the document toward the second discharge portion.