Medium feeding device and medium processing device including the same

A medium feeding device, comprising:

• a container member that accommodates sheet media;
• a discharging member disposed further than the media accommodated in the container member in a discharging direction in which the media are discharged, to discharge the media one by one;
• a hand-over member disposed above the container member at a position closer to the discharging member to suck the media accommodated in the container member with air and pass the media to the discharging member;
• a floating device disposed on a side of the media accommodated in the container member to blow air to an upper area of a side end surface of the media and float the media while an upper portion of the media is separated;
• and
• an auxiliary suction member disposed above the container member on a side of the hand-over member opposite to a side closer to the discharging member in the discharging direction in which the media are discharged, such that a downstream edge of the auxiliary suction member is upstream of an upstream-most edge of the hand-over member, to suck the media accommodated in the container member with air,
• wherein the auxiliary suction member is disposed at a first distance from the hand-over member, and is disposed at a second distance from an end portion of the media accommodated in the container member opposite to an end portion of the media located closer to the discharging member, the first distance being less than the second distance, and
• wherein the auxiliary suction member includes a moving duct having a lower end portion vertically movable, and moves the moving duct to a predetermined lower target position to start an air-suction operation.