Provided are a filtering medium for selective adsorption of blood components, which is excellent in selective removal of blood components such as a leukocyte; and a blood filter formed of the filtering medium. The filtering medium for selective adsorption of blood components contains a cellulose acylate, and has a glass transition temperature of 126°C or higher, an average through-hole diameter of 0.1 to 50 µm, and a specific surface area of 1.0 to 100 m2/g.