Provision of a blood purification system comprising a blood purification tubing and a blood purification apparatus particularly suitable for use in continuous hemofiltration in which in the treatment of a patient with renal disease, multiple organ failure, and the like, the amount of water removed from the patient and the amount of supply to the patient can be more accurately controlled, and in which preparation operation is easy. A blood purification system comprising a blood purification tubing and a blood purification apparatus wherein the soft tubes of flow paths 14, 15, 33, 34, and 53 connecting a first planar panel 1 and a second planar panel 2, and the location of the soft tubes are selected to satisfy a formula of a predetermined condition.
