[Problem] Provided is an extracorporeal circulator in which extracorporeal circulation manipulation can be safely performed during a surgical operation while erroneous manipulation causing a rotation speed of a motor to drop to a lower limit rotation speed or lower is prevented in the extracorporeal circulator.[Solution] An extracorporeal circulator 1 includes a control unit 100, a manipulation section (for example, a rotary manipulation section 51) that is able to set a lower limit rotation speed setting value of a motor in a changeable manner, a rotation display section 60 that is able to display the lower limit rotation setting value of a motor 4 in accordance with a command of the control unit 100, and a display section 30. The lower limit rotation speed setting value is a minimum rotation speed for preventing backflow of blood inside a circulation circuit 1R when a manipulator performs a manipulation so as to operate the motor 4 and to cause the blood to return from an artificial lung 2 to an inside of a body of a patient P that is a patient while a command is applied to the control unit 100 so that a rotation speed of the motor 4 can be changed.
