PROBLEM TO BE SOLVED: To provide a blood purification system capable of accurately and automatically measuring the concentration of a dialysate solution supplied from dialysate solution supply means to blood purification means during blood purification treatment, and further correctly determining propriety of the concentration of the dialysate solution.SOLUTION: A blood purification system includes: a plurality of blood purification means 1 attached with a blood purifier for applying blood purification treatment to patients； dialysate solution supply means 2 capable of supplying a dialysate solution to each of the blood purification means 1； and a supply flow passage H for circulating and supplying a dialysate solution from the dialysate solution supply means 2 to the blood purification means 1. There are also included concentration measuring means (M1-M3) capable of measuring over time the concentration of individual component contained in a dialysate solution which is circulated in the supply flow passage H during blood purification treatment.SELECTED DRAWING: Figure 1
