Image reading device

An image reading device comprising:

• a medium support portion that supports a medium;
• a supply roller that supplies the medium;
• a transport path through which the medium supplied by the supply roller passes;
• a cover that is displaced between an open position in which the transport path is open and a closed position in which the transport path is closed;
• a reading unit that reads an image on the medium transported on the transport path;
• and
• a transport unit that is disposed on the transport path further upstream than the reading unit and that transports the medium to the reading unit, wherein
• the transport unit includes:
• a driving roller, and
• a driven roller that nips the medium between the driving roller and the driven roller, wherein
• the driving roller is provided in a first unit,
• the driven roller is provided in a second unit, and
• when the cover is displaced from the closed position to the open position, the second unit is moved so as to separate the driven roller away from the driving roller.