50 weight % of average of percentage of water content of hollow yarn in the front phase of the sterilization process due to radiation lighting concerning the above-mentioned blood depurator 1 of the dry type restoration the water beforehand, film above 300 weight % after the 1st percentage of water content adjustment process (1st dry process) and the sterilization process which are adjusted under, it features that it includes the 2nd percentage of water content adjustment process (2nd dry process) which 50 weight % of average of percentage of water content of hollow yarn film adjusts under and.水を予め充填しないドライタイプの上記血液浄化器1について、放射線照射による滅菌工程の前段階において中空糸膜の含水率の平均値を50重量%以上300重量%未満に調整する第1の含水率調整工程(第1乾燥工程)と、滅菌工程後、中空糸膜の含水率の平均値を50重量%未満に調整する第2の含水率調整工程(第2乾燥工程)と、を含むことを特徴とする。
