A sheet conveying device, comprising: a first sheet conveying path, having a curved feed turning portion, to feed and convey a sheet therethrough; a second sheet conveying path, having a curved feed turning portion different from the first sheet conveying path, to feed and convey the sheet therethrough; a first sheet feeding member, disposed upstream of the second sheet conveying path, to feed the sheet; a third sheet conveying path provided from a confluence of the first sheet conveying path and the second sheet conveying path; a belt-type sheet conveying unit including a first roller and at least one second roller rotatably holding a conveyor belt such that a section of the conveyor belt spans between the two rollers, the belt-type sheet conveying unit facing a rotary feed driving member, the at least one second roller disposed upstream of the first roller in the sheet travel direction; and a first guide member that forms at least a part of the second sheet conveying path, the second sheet conveying path further having an inner portion formed by a second guide member having a guide surface to guide the sheet; wherein: the belt-type sheet conveying unit is provided with the conveyor belt to rotate with the rotary feed driving member and to contact a surface of the sheet to increase a conveying force on the sheet; at least a part of the second sheet conveying path includes the belt-type sheet conveying unit and the first guide member disposed facing the belt-type sheet conveying unit; said section of the conveyor belt is disposed along 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; the belt-type sheet conveying unit and the first guide member are arranged such that a leading edge of a sheet conveyed from the first sheet conveying path contacts said section of the conveyor belt spanning between the two rollers; a line connecting a distal end of first roller and a distal end of the at least one second roller is defined as a first tangent line, a line connecting the distal end of the at least one second roller and a distal end of the first sheet feeding member is defined as a second tangent line, the guide surface forming the second sheet conveying path being more medially located than the first and second tangent lines (A1, B1); and a smaller angle between the distal end of the at least one second roller and the guide surface forming the second sheet conveying path is defined as a first angle (θa), the at least one second roller and the guide surface being located to cause the first angle (θa) to form an obtuse angle. a first sheet conveying path, having a curved feed turning portion, to feed and convey a sheet therethrough; a second sheet conveying path, having a curved feed turning portion different from the first sheet conveying path, to feed and convey the sheet therethrough; a first sheet feeding member, disposed upstream of the second sheet conveying path, to feed the sheet; a third sheet conveying path provided from a confluence of the first sheet conveying path and the second sheet conveying path; a belt-type sheet conveying unit including a first roller and at least one second roller rotatably holding a conveyor belt such that a section of the conveyor belt spans between the two rollers, the belt-type sheet conveying unit facing a rotary feed driving member, the at least one second roller disposed upstream of the first roller in the sheet travel direction; and a first guide member that forms at least a part of the second sheet conveying path, the second sheet conveying path further having an inner portion formed by a second guide member having a guide surface to guide the sheet; the belt-type sheet conveying unit is provided with the conveyor belt to rotate with the rotary feed driving member and to contact a surface of the sheet to increase a conveying force on the sheet; at least a part of the second sheet conveying path includes the belt-type sheet conveying unit and the first guide member disposed facing the belt-type sheet conveying unit; said section of the conveyor belt is disposed along 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; the belt-type sheet conveying unit and the first guide member are arranged such that a leading edge of a sheet conveyed from the first sheet conveying path contacts said section of the conveyor belt spanning between the two rollers; a line connecting a distal end of first roller and a distal end of the at least one second roller is defined as a first tangent line, a line connecting the distal end of the at least one second roller and a distal end of the first sheet feeding member is defined as a second tangent line, the guide surface forming the second sheet conveying path being more medially located than the first and second tangent lines (A1, B1); and a smaller angle between the distal end of the at least one second roller and the guide surface forming the second sheet conveying path is defined as a first angle (θa), the at least one second roller and the guide surface being located to cause the first angle (θa) to form an obtuse angle.