23 Provided are an aggregate removing filter material an aggregate removal method a white blood cell removing filter and a blood product filtering method the filter material enabling the efficient removal of aggregates while preventing clogging by the aggregates. The aggregate removing filter material for removing aggregates in blood products is composed only of fibers having a length of 100 1000mm and a density of 0.7 4.0dtex has a basis weight of 20 100g/m and has a no load bulk density of 0.03 0.10g/cm.
