A blood purification apparatus which can easily and quickly find a cause for alarm issuing. The blood purification apparatus that performs blood purification treatment by purifying blood of a patient which is extracorporeally circulated and that includes a display device 2 which performs a display relating to the blood purification treatment. The display device 2 can switch and display a plurality of screens including an alarm screen displayed due to alarm issuing. The alarm screen is displayed together with multiple type information items required for finding a cause for the alarm issuing.
