[Object] To provide a blood purification system which can cause blood purification means to be individually operated depending on various situations.[Solution] In the blood purification system including a plurality of monitoring devices 1 to which a dialyzer 5 is attached in order to perform a blood purification treatment on a patient, and a dialysate supplying device 2 capable of supplying a dialysate to each of the monitoring devices 1, the plurality of monitoring devices 1 and the dialysate supplying device 2 are connected to each other by a LAN cable α. Thus, predetermined information can be transmitted from the dialysate supplying device 2 to a specified monitoring device 1 out of the plurality of monitoring devices 1, and the specified monitoring device 1 can be caused to perform an individually operation.