BLOOD PURIFICATION DEVICE

A blood purification device 1 is provided with: a blood circuit 2 for extracorporeally circulating blood of a patient; a liquid supply circuit 4 for supplying a supply liquid to the blood circuit 2 or a blood purifier 3 provided in the blood circuit; and a waste liquid discharge circuit 5 for discharging a waste liquid from the blood purifier 3. Each of the blood circuit 2, the liquid supply circuit 4, and the waste liquid discharge circuit 5 comprises a flexible tube, and multiple types of tubes with different inner diameters can be applied to each circuit. The blood purification device 1 is provided with a tube identification unit 11 which performs a tube identification process for identifying tubes used in the blood circuit 2, the liquid supply circuit 4, and the waste liquid discharge circuit 5 or determining the presence or absence of an abnormality in the tubes on the basis of the amount of liquid supplied from a peristaltic pump provided in the blood circuit 2, the liquid supply circuit 4, or the waste liquid discharge circuit 5 by driving the pump for a predetermined time or changes in pressure in the circuits.