Medium feeding device with rotational difference generating unit

A medium feeding device comprising:

• a feeding roller that conveys a medium in a conveying direction;
• a brake roller that includes a first roller and a second roller that are arranged to be independently rotatable around one shaft and cause a conveyance load to act on the medium that has entered between the feeding roller and the brake roller, the brake roller being arranged to press the feeding roller with a predetermined pressure, each of the first roller and the second roller being independently controlled whether to rotate along with rotation of the feeding roller or generate a rotational load in accordance with a torque received by each of the first roller and the second roller;
• and
• a rotational difference generating unit that generates a rotational difference between the first roller and the second roller so that the conveyance load acting on the medium by the first roller and the second roller becomes even, the rotational difference generating unit including a first rotational difference generating unit and a second rotational difference generating unit, wherein the first roller and the second roller include therein the first rotational difference generating unit and the second rotational difference generating unit, respectively.