Blood purification device and method for controlling liquid feed pump

A blood purification device to perform blood purification treatment through a blood purifier that purifies blood of a patient, the blood purification device comprising:

• a dialysate circuit to supply dialysate to the blood purifier and discharge dialysate from the blood purifier;
• a liquid feed pump arranged on the dialysate circuit to feed dialysate in the dialysate circuit;
• a drive control unit that executes a drive control operation to control the liquid feed pump so that a flow rate of the liquid feed pump achieves a target flow rate;
• and
• a flow rate detection unit to detect the flow rate of the liquid feed pump,
• wherein in the drive control operation, feedforward control not based on a detection value of the flow rate detection unit is implemented, and the control is switched from the feedforward control to feedback control based on a detection value of the flow rate detection unit on the condition that a predetermined time has elapsed or a predetermined flow rate has been reached.