Provided are an aggregate-removing filter material enabling the efficient removal of aggregates while preventing the clogging by the aggregates, an aggregate removal method, a white blood cell-removing filter, and a blood product filtering method. An aggregate-removing filter material for removing aggregates in a blood product, which is composed only of fibers having a fiber length of 100 to 1000 mm, and a fineness of 0.7 to 4.0 dtex, and has a basis weight of 20 to 100 g/m 2 , and a no-load bulk density of 0.03 to 0.10 g/cm 3 .
