Infusion-tube pressing parts (23) that presses a flexible infusion tube (41) and an infusion-tube receiving surface (81) that serves as a receiving surface to press the infusion tube (41) are provided, and a restoration mechanism (24) that moves along the infusion-tube receiving surface (81) together with the infusion-tube pressing parts (23) and presses two sides of the infusion tube (41) pressed by the infusion-tube pressing parts (23) is provided between the infusion-tube pressing parts (23).