A lid that retains a pump tube which is elastic; a finger driving unit that is disposed facing the lid with the pump tube interposed therebetween, and that causes a plurality of fingers to sequentially move in the direction of contacting and separating from the lid; and a pump tube opening/closing mechanism that causes the finger driving unit to advance towards and retract from the lid, and that closes and opens the pump tube which is disposed between the fingers and the lid.