A feeder device for feeding media sheets along a feed path, including: (a) an accommodator for accommodating the media sheets; (b) a feed mechanism including (b-1) a roller that is to be held in contact with the media sheets accommodated in the accommodator and (b-2) a motor that is controllable based on a variable so as to rotate the roller, so that the media sheets can be fed along the feed path by the roller; (c) a detector operable to detect an amount of rotation of the roller or the motor; (d) a controller operable to adjust the variable on the basis of the amount of rotation detected by the detector such that feed movement of each media sheet can be achieved substantially as desired; (e) a monitor operable to monitor the variable that is adjusted by the controller; and (f) a media-related information obtainer operable to obtain information related to the media sheets fed by the feed mechanism, based on the actual value of the adjusted variable monitored by the monitor.