A medium feeding device includes a feed roller pair, a transport roller, a medium guiding path section, and a controller. The feed roller pair includes a feed driving roller driven by power and a feed driven roller to be rotationally driven, and feeds a medium to be fed toward the downstream side in a feed direction. The feed driving roller and the feed driven roller are separated from each other. The transport roller pair transports the medium, which is fed by the feed roller pair, toward the downstream side in the feed direction. The transport roller pair includes a transport driving roller that is disposed on the downstream side of the feed roller pair in the feed direction and is driven by power and a transport driven roller that is rotationally driven.