Separation membrane for blood processing and blood processing apparatus having the membrane installed therein

A hollow-fiber separation membrane for blood processing comprising

• a polysulfone polymer,
• a hydrophilic polymer and
• a polymer having a hydroxy group in a side chain and having a solubility of 0.5 g or less in 100 g of water at 20° C., wherein
• the content of the polymer in the hollow-fiber separation membrane is 0.11 to 0.6 mass %;
• the average concentration of the polymer in a functional separation surface of the hollow-fiber separation membrane is 20 mass % or more, and a maximum value and a minimum value of the polymer concentration in the functional separation surface fall within the range of (the average concentration of the polymer in the functional separation surface)±15%;
• the average concentration of the polymer in the functional separation surface relative to the content of the polymer in the hollow-fiber separation membrane is 100 times or more;
• and
• the polymer having a hydroxy group in a side chain is a polymer obtained by polymerizing only an acrylate monomer and/or methacrylate monomer having a hydroxy group in a side chain or polymerizing so as to partly contain such a monomer.