Abstract: The present invention discloses an automatic sheet feeder to feed manuscript sheets onto and discharge the same from the top of the overhead projector. The automatic sheet feeder comprises a stage glass on which the manuscript is to be set, a common feeding rollers for forward and backward rotations to feed the horizontally or vertically positioned manuscript and a side feeding roller located at a side of the stage glass to carry the manuscript with pressing the upper face of a side edge of the manuscript.