The purpose of the present invention is to provide a carrier for blood component adsorption which can adsorb and remove leukocytes in the form of granulocytes, monocytes or lymphocytes, and can also adsorb and remove inflammatory cytokines at the same time while minimizing the occurrence of pressure loss in blood circulation. The present invention provides a carrier for blood component adsorption, wherein a functional group containing an acid functionality selected from the group consisting of a sulfate group, a sulfite group and a sulfonate group, and an amino group, is introduced onto the surface of a water-insoluble carrier that is composed of fiber or particles, and the fiber diameter of the fiber or the particle size of the particles is 0.5 to 20 μm.
