A blood separation device (4) for separating blood (16) into several blood components (16a; 16b; 16c) under the influence of a centrifugal force (Fz) generated during a centrifugation process in a centrifuge has: a first chamber (4a) for receiving a blood bag ( 12), which is filled with the blood (16) to be separated, which under the influence of centrifugal force (Fz) separates into the individual blood components (16a; 16b; 16c) in such a way that each blood component (16a; 16b; 16c) is separated Completion of the centrifugation process - viewed in the direction of the centrifugal force (Fz, “direction of separation”) - is located in a separate section of the blood bag (12) according to its specific weight; a second chamber (4b) for receiving at least one component bag (13; 14), which is provided for filling with a respective associated blood component (16a; 16b; 16c) after the centrifugation process has ended, an inlet opening of each component bag (13; 14) over a line (12a; 13a; 14a) in which a controllable valve is arranged is connected to an outlet opening of the blood bag (12); a displacement body (8) which is arranged in the first chamber (4a) and exerts a pressing force (Fp) directed essentially perpendicular to the separation direction on the blood bag (12); and a control unit (5) which, after the centrifugation process has ended, opens each valve until the blood component (16a; 16b; 16c) assigned to this valve into the assigned component bag (13; 14) as a result of the pressing force (Fp) of the displacement body (8) ) has arrived. The displacement body (8) is shaped in such a way that it generates the pressing force (Fp) with the aid of centrifugal force (Fz) and / or with the aid of a spring force (Ff).
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