A sheet conveyor includes a conveying path along which a sheet is conveyed and a transparent member disposed on the conveying path and including a surface facing the sheet being conveyed. The transparent member including a reference line extending across the transparent member in a direction perpendicular to the conveying direction. The sheet conveyor further includes a guide member comprising a guide edge that includes a first guide edge and a second guide edge, the guide edge having a shape, such that a distance from the guide edge to the reference line varies in the direction in which the reference line extends. The guide edge further may include a first guide portion and a second guide portion. The guide member is disposed upstream of the transparent member in a conveying direction of the sheet, and the guide member is configured to guide the sheet to the transparent member. The first guide portion may include a first guide edge disposed separate from a reference line by a first distance. The second guide portion also may include a second guide edge disposed separate from the reference line by a second distance different from the first distance.