A separation device comprising: a first shredding unit that shreds a processing target containing a first material and a second material adhering to the first material; a first separation unit that has a first tubular portion in which first holes that allow the second material contained in the processing target shredded by the first shredding unit to pass through without allowing the first material to pass through are formed, and that separates the second material passing through the first holes from the processing target by rotating the first tubular portion in a state in which the processing target shredded by the first shredding unit is accommodated in the first tubular portion; a second shredding unit that shreds the processing target from which the second material passing through the first holes is separated by the first separation unit; and a second separation unit that has a second tubular portion in which second holes that allow the second material contained in the processing target shredded by the second shredding unit to pass through without allowing the first material to pass through are formed, and that separates the second material passing through the second holes from the processing target by rotating the second tubular portion in a state in which the processing target shredded by the second shredding unit is accommodated in the second tubular portion, wherein the first separation unit includes inside the first tubular portion: a first rotating rod that has a central axis coinciding with a central axis of the first tubular portion and is provided so as to be rotatable about the central axis of the first rotating rod; and a first screw member that is helically provided around the first rotating rod and has a plurality of teeth formed in the first screw member. a first shredding unit that shreds a processing target containing a first material and a second material adhering to the first material; a first separation unit that has a first tubular portion in which first holes that allow the second material contained in the processing target shredded by the first shredding unit to pass through without allowing the first material to pass through are formed, and that separates the second material passing through the first holes from the processing target by rotating the first tubular portion in a state in which the processing target shredded by the first shredding unit is accommodated in the first tubular portion; a second shredding unit that shreds the processing target from which the second material passing through the first holes is separated by the first separation unit; and a second separation unit that has a second tubular portion in which second holes that allow the second material contained in the processing target shredded by the second shredding unit to pass through without allowing the first material to pass through are formed, and that separates the second material passing through the second holes from the processing target by rotating the second tubular portion in a state in which the processing target shredded by the second shredding unit is accommodated in the second tubular portion, a first rotating rod that has a central axis coinciding with a central axis of the first tubular portion and is provided so as to be rotatable about the central axis of the first rotating rod; and a first screw member that is helically provided around the first rotating rod and has a plurality of teeth formed in the first screw member.