An objective of the present disclosure is to provide an adsorption materialthat can selectively adsorb immunosuppressive leukocyte. The presentdisclosure provides an adsorption material for immunosuppressive leukocyte.The adsorption material includes a water-insoluble carrier to which at leastonenitrogen-containing compound selected from a polyamine represented by apredetermined formula and aliphatic amines represented by predeterminedformulae are bound. A form of the water-insoluble carrier is a fiber or aparticle,a diameter of the fiber or the particle is 15 to 50 µm, and an arithmeticmeanroughness of a surface of the water-insoluble carrier is 0.1 to 3.0 µm.
