There is disclosed a sheet distribution device in which by using a junction conveying means for conveying sheets from a main sorter unit to a slave sorter unit also as a first conveying portion of the sheet distribution device when sheet distribution devices are interconnected, the manufacture cost of the sheet distribution device is reduced. The interconnectable sheet distribution device is provided with a first conveying portion 5A for receiving an image formed sheet 2 from an image forming device 1 to convey the sheet into a body and a second conveying portion 5B for receiving the sheet 2 from the first conveying portion 5A to convey the sheet to each of plural distribution bins 4. At the time of interconnection, a third conveying portion 5D (junction conveying means) for conveying the sheet 2 from a main sorter unit S1 to a slave sorter unit S2 is used also as the first conveying portion 5A. The sheet distribution device has a space for storing the first conveying portion 5A at the time of interconnection.