A sheet conveyor includes a conveyance belt configured to convey a sheet on a first surface of the conveyance belt in a conveyance direction, a suction device configured to suck the sheet onto the conveyance belt via the conveyance belt, and multiple supports between the conveyance belt and the suction device in a vertical direction, the multiple supports configured to support a second surface of the conveyance belt. A longitudinal direction of each of the multiple supports is parallel to a direction intersecting the conveyance direction, and the multiple supports are arrayed in the conveyance direction.