A blood purification apparatus comprising: a blood circuit including an arterial blood circuit to a distal end of which an arterial puncture needle (a) is connectable, and a venous blood circuit to a distal end of which a venous puncture needle (b) is connectable, the blood circuit being capable of extracorporeally circulating blood of a patient; a blood purification device provided between the arterial blood circuit and the venous blood circuit of the blood circuit and being capable of purifying the blood flowing through the blood circuit; a blood pump provided to the arterial blood circuit and being configured to deliver liquid when activated; and a control device that is configured to execute a connected step in which the blood pump is activated with the arterial puncture needle (a) and the venous puncture needle (b) being stuck in the patient, and an unconnected step in which the blood pump is activated and delivers liquid at a preset flow rate with neither the arterial puncture needle (a) nor the venous puncture needle (b) being stuck in the patient, wherein the control device is configured to establish, in the unconnected step, a restricted state where behavior of the blood pump at the activation of the blood pump is restricted, wherein, in the restricted state, the blood pump is operated at a flow rate lower than the preset flow rate for a predetermined period of time or is kept in a stopped state for a predetermined period of time, characterized in that the control device is configured to establish the restricted state only at the activation of the blood pump after transition from the connected step to the unconnected step. a blood circuit including an arterial blood circuit to a distal end of which an arterial puncture needle (a) is connectable, and a venous blood circuit to a distal end of which a venous puncture needle (b) is connectable, the blood circuit being capable of extracorporeally circulating blood of a patient; a blood purification device provided between the arterial blood circuit and the venous blood circuit of the blood circuit and being capable of purifying the blood flowing through the blood circuit; a blood pump provided to the arterial blood circuit and being configured to deliver liquid when activated; and a control device that is configured to execute a connected step in which the blood pump is activated with the arterial puncture needle (a) and the venous puncture needle (b) being stuck in the patient, and an unconnected step in which the blood pump is activated and delivers liquid at a preset flow rate with neither the arterial puncture needle (a) nor the venous puncture needle (b) being stuck in the patient, wherein the control device is configured to establish, in the unconnected step, a restricted state where behavior of the blood pump at the activation of the blood pump is restricted, wherein, in the restricted state, the blood pump is operated at a flow rate lower than the preset flow rate for a predetermined period of time or is kept in a stopped state for a predetermined period of time, characterized in that the control device is configured to establish the restricted state only at the activation of the blood pump after transition from the connected step to the unconnected step.