<p>The present invention provides a sheet supply apparatus comprising sheet stacking means for stacking sheets, sheet supply means for feeding out the sheets stacked on the sheet stacking means, separation means for separating the sheets fed out by the sheet supply means one by one, and friction separation pad means provided on a sheet stacking surface of the sheet stacking means in a confronting relation to the sheet supply means. Wherein the separation pad means is so constructed that a surface of the separation pad means opposed to the sheet supply means has an upstream side high level surface portion and a downstream side low level portion in a sheet supplying direction. <IMAGE></p>