Medium transport device and image reading apparatus

A medium transport device comprising:

• a placement section on which a medium is placed;
• a transport path through which the medium is transported;
• a feeding roller that feeds the medium placed on the placement section in the transport path;
• a set guide that guides the medium to the feeding roller, the set guide configured to switch between a contact position where the medium and the feeding roller are brought into contact and a separation position where the medium and the feeding roller are separated;
• a restricting section configured to switch between a restricting position for restricting feeding of the medium by bringing the feeding roller into contact with a leading end of the medium in a feeding direction and an allowing position for allowing the feeding of the medium;
• and
• a drive source that generates power for switching of the set guide and switching of the restricting section,
• wherein the set guide and the restricting section are provided below the transport path in a direction of gravity.