PROBLEM TO BE SOLVED: To prevent occurrence of clotting and blockage of blood in a blood circuit caused by a pressure sensor.SOLUTION: A hemodiafiltration-dialysis device 1 has a dialyzer 10, the blood circuit 11, and a pump 30. The blood circuit 11 has a first flow path 31 connected to the pump 30 from a blood-collecting side end 11a, a second flow path 32 connected to the dialyzer 10 from the pump 30, and a third flow path 33 connected to the dialyzer 10 from a blood-returning side end 11b. The first flow path 31, the second flow path 32, and the third flow path 33 are connected with branched flow paths 40, 60, 80 respectively, and the branched flow paths 40, 60, 80 respectively have pressure sensors 52, 72, 92 for detecting the pressure of the flow paths 31, 32, 33.
