A sheet feeder has a plurality of sheets supported on an intermediate plate, and feeds sheets separately one by one by attracting them by a suction belt. To a chloroprene rubber including a 2,3-dichlorobutadiene unit in an amount of 5 to 20% by mass, a natural rubber is added so as to give a ratio of 6040 to 955 by mass ratio. A second body has a second mating surface configured to mate with the first mating surface of the first body.