Provided is an extracorporeal circulation device whereby the risk of bubble generation can be reduced and the patient's conditions can be easily understood.The extracorporeal circulation device, said extracorporeal circulation device comprising a blood removal line (11) through which blood drawn from a subject's body passes, a centrifugal pump (4) which is connected to the downstream of the blood removal line (11) and sends the blood by rotary motion, an artificial lung (2) which is connected on the downstream side of the centrifugal pump (4), a blood sending line (12) which is disposed on the downstream side of the artificial lung (2) and sends back the blood into the body, and a flow rate sensor (52) which detects the blood flow rate in the blood sending line (12), is characterized by being provided with an intermediate pressure sensor (8), which is a pressure sensor detecting the pressure in a circuit between the centrifugal pump (4) and the artificial lung (2), and a controller (10) which specifies an intrinsic discharge pressure of the centrifugal pump (4) on the basis of the rotational frequency of the centrifugal pump 4 and the blood flow rate detected by the flow rate sensor (52).L'invention concerne un dispositif de circulation extracorporel, permettant de réduire le risque de génération de bulle et de comprendre facilement les affections d'un patient. Le dispositif de circulation extracorporel, ledit dispositif de circulation extracorporel comprenant une ligne de retrait de sang (11) à travers laquelle passe le sang aspiré du corps d'un sujet, une pompe centrifuge (4) qui est reliée à l'aval de la ligne de retrait de sang (11) et envoie le sang par un mouvement de rotation, un poumon artificiel (2) qui est relié sur le côté aval de la pompe centrifuge (4), une ligne d'envoi de sang (12) qui est disposée sur le côté aval du poumon artificiel (2) et renvoie le sang dans le corps, et un capteur de débit (52) qui détecte le débit sanguin dans la ligne d'envo
