Provided is an extracorporeal circulation management device and the like which allows a healthcare professional to recognize granular changes in blood in a blood storage tank such as a reservoir in a sanitary manner without having a sensor or the like disposed in the blood storage tank. This extracorporeal circulation management device comprises a processing unit (43) disposed in a tube (12) for guiding blood from a blood storage part (11) which stores the blood and is exposed to atmosphere. The processing unit (43) generates stored blood change information which is information on changes in the amount of the blood in the blood storage part on the basis of pressure change information which is information on changes in pressure of a pressure measurement part (14) for measuring the pressure of the blood in the tube.
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