A sheet dryer includes sprockets and a delivery chain, at least one heat-resistant glass plate, at least one lower-surface drying lamp, a guide plate, a plurality of first discharge holes, and a plurality of second discharge holes. The sprockets and delivery chain convey a paper sheet along a convey path. The heat-resistant glass plate is arranged under the sheet convey path. The lower-surface drying lamp is arranged under the heat-resistant glass plate and dries the lower surface of the printed/coated paper sheet. The guide plate is arranged adjacent to the heat-resistant glass plate in a sheet convey direction. The first discharge holes are formed in the heat-resistant glass plate. Air is discharged upward through the first discharge holes. The second discharge holes are formed in the guide plate. Air is discharged through the second discharge holes in the widthwise direction of the paper sheet.