An image reading apparatus includes a discharging unit that discharges an original document read by a reading unit to a stacker, in which a controller of the image reading apparatus discharges a first original document at a first transporting speed caused when the original document specified from an original document length measured by the measuring unit is the first original document and discharges a second original document at a second transporting speed slower than the first transporting speed caused when the original document is the second original document longer than the first original document.