A sheet conveyer, comprising: a sheet support surface; a first roller to convey sheets; a second roller to separate one by one the sheets; a holder to be swingably supported about a swing center axis, wherein the first roller is attached to the holder to be rotatable; and a pressing unit to press the first roller toward the sheet support surface, wherein the pressing unit is disposed between a first portion of the holder and a second portion opposite to the sheet support surface with respect to the holder, the pressing unit is configured to press the first portion to move away from the second portion, and the pressing unit and the first roller are disposed not to overlap with each other in regard to an axis direction of the first roller.