MEDIUM FEEDING DEVICE

A medium feeding device includes a container member (1) that accommodates sheet media, a discharging member (2) located 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 (3) disposed above the container member to suck the media accommodated in the container member with air and pass the media to the discharging member, a floating device (4) 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 to float the media while an upper portion of the media is separated, a detector (5) that detects a separation state of the medium floated by the floating device, and a controller (6) that controls a medium-feeding operation including a pre-feeding blowing operation (BL0) and a during-feeding blowing operation (BL1), the pre-feeding blowing operation serving as an air blowing operation performed by the floating device before the medium is fed, and the during-feeding blowing operation serving as an air blowing operation performed by the floating device from a start of feeding the medium and an end of feeding the medium. While performing the pre-feeding blowing operation or the during-feeding blowing operation, the controller performs detection with the detector, and on condition that a result of the detection fails to satisfy a preset target range, the controller changes a parameter for the medium-feeding operation including at least one of the pre-feeding blowing operation or the during-feeding blowing operation.