Disclosed is an adsorption carrier which can remove a cell occurring in the blood, preferably an activated leukocyte such as a granulocyte or a monocyte or a cancer cell, more preferably a cytokine present in an excessive amount, and which has a significantly increased cytokine-adsorbing ability compared to a conventional technique. The adsorption carrier comprises a fiber A having a diameter of 0.5 to 8 [mu]m inclusive and a fiber B having a diameter of 8 to 50 [mu]m inclusive, wherein the diameter of the fiber B is larger than that of the fiber A, and the fiber B comprises a sheath-core-type or island-sea-type composite fiber.
