A sheet conveying device, that can be included in an image forming apparatus, includes a first sheet conveying path, a second sheet conveying path, a third conveying path, and a belt-type sheet conveying unit. The first sheet conveying path has a curved portion, and feeds and conveys a sheet therethrough. The second sheet conveying path has a curved portion and different from the first sheet conveying path, and feeds and conveys the sheet therethrough. The third sheet conveying path is provided from a confluence of the first sheet conveying path and the second sheet conveying path. The belt-type sheet conveying unit is disposed on one side of the third sheet conveying path corresponding to an outer side of the curved portion of the first sheet conveying path and an inner side of the curved portion of the second sheet conveying path.