Provided is a hemodialysis device with which it is possible to effectively make the blood flow to extremities in the body of a dialysis patient when performing hemodialysis by means of HDF. A hemodialysis device 1 is provided with a blood dialyzer (10), a blood circuit (20), a dialysate circuit (30), a temperature adjusting unit (40) that adjusts the temperature of dialysate, and a control device (50), wherein the control device (50) is provided with: a first control unit (51) that controls the dialysate flow volume so that the amount of blood flowing in a venous line (22) becomes equal to or less than the amount of blood taken into an arterial line (21) a second control unit (52) that controls the dialysate flow volume so that the amount of blood flowing in the venous line (22) becomes greater than the amount of blood taken into the arterial line (21) and a dialysate temperature control unit (53) that controls the temperature adjusting unit (40) so that the temperature of the dialysate when performing control by means of the second control unit (52) becomes different from the temperature when performing control by means of the first control unit (51).Linvention concerne un dispositif dhémodialyse grâce auquel il est possible damener le sang à sécouler efficacement jusquaux extrémités dans le corps dun patient sous dialyse lors de lexécution dune hémodialyse au moyen de HDF. Un dispositif dhémodialyse 1 est pourvu dun dialyseur sanguin (10), dun circuit sanguin (20), dun circuit de dialysat (30), dune unité de réglage de température (40) qui règle la température du dialysat, et dun dispositif de commande (50), le dispositif de commande (50) comportant : une première unité de commande (51) qui commande le volume découlement de dialysat de telle sorte que la quantité de sang sécoulant dans une ligne veineuse (22) devient inférieure ou égale à la quantité de sang prélevé dans une ligne artérielle (21) une seconde unité de commande (52) qui commande le volume découleme
