Abstract: A document reading apparatus is provided with a feed roller that feeds a document in its feeding direction while making contact therewith, a rotation driving power source that rotationally drives the feed roller, and a power transmitting mechanism enabled to transmit rotational driving power from the rotation driving power source to the feed roller. Two driving paths, each having a reduction ratio different from the other corresponding to two resolutions, are provided at at least one part of the power transmitting mechanism and a planetary gear for selecting one of the driving paths as a transmitting path of the aforesaid rotational driving power is provided at a branch point of the power transmitting mechanism. Which resolution to select is determined and selection of the driving path is controlled by a selector based on the result of the determination.