This blood purification device (100) is provided with: a device body (110) to which an extracorporeal circulation circuit can be attached/detached pumps (120, 122, 124) for sending liquid into the extracorporeal circulation circuit a heat source machine (130) for heating the liquid flowing through the extracorporeal circulation circuit an actual flow rate information generation unit (150) for measuring the actual flow rate of the liquid passing through the heat source machine (130) and generating information pertaining to the actual flow rate of the liquid and a main control unit (160) for executing a variety of controls.