Blood purification device

A blood purification device to purify blood of a patient through a blood purifier comprising a blood purification membrane therein, the blood purification device comprising:

• a blood circuit to circulate the blood through the blood purifier;
• a dialysate supply flow path to supply dialysate to the blood purifier;
• an effluent discharge flow path to discharge effluent from the blood purifier;
• a liquid supply pump arranged on the dialysate supply flow path to cause pressure for supply to the blood purifier to be applied to the dialysate;
• and
• a liquid discharge pump that is arranged on the effluent discharge flow path, is provided separately and can be driven independently from the liquid supply pump, and causes pressure for discharge from the blood purifier to be applied to the effluent,
• wherein a liquid in the blood circuit is suctioned into the effluent discharge flow path by driving the liquid discharge pump in a state in which the blood circuit and the effluent discharge flow path are connected in a manner that allows for liquid feeding through a connecting flow path connecting the blood circuit to the effluent discharge flow path while bypassing the blood purifier, or through the blood purifier.