This blood component separation device: is provided with a centrifugal separator for separating a plurality of prescribed blood components from blood, and a container for holding the prescribed blood components that have been centrifugally separated and performs a step in which the separated plurality of blood components are each collected over a plurality of cycles. The blood component separation device performs a step in which the starting point of the step for collecting the prescribed blood components is determined from blood count values of a donor on the basis of map data pertaining to pre-stored blood count values or the concentrations of prescribed blood components, in such a manner that the concentrations of the prescribed blood components become equal at each point that the blood components are discharged from the centrifugal separator at the collection starting point and finishing point in the step for collecting the prescribed blood components.
