PROBLEM TO BE SOLVED: To provide a blood purifier having a high phosphorous absorption property which can be safely used, and having a porous hollow fiber membrane.SOLUTION: A blood purifier having a hollow fiber membrane containing an inorganic ion absorptive body, in which, when a liquid concentrate in which a physiological saline is added to a bovine serum to adjust a total protein concentration to 6.5 g/dL is passed through the hollow fiber membrane for 60 min to collect the filtrate under a pressure of in-membrane pressure difference of 25 mmHg and measure the concentration of albumin by BCG method, the transmission factor represented by a formula (1): albumin transmission factor (%)=albumin concentration of the filtrate/albumin concentration of the liquid concentrate×100 is 5% or less, the number of fine particles of 10 μm or more in 1 mL of physiological saline for injection of three month and after six month after injecting the physiological saline for injection into the blood purifier is 25 or less, and the number of fine particles of 25 μm or more is 3 or less.SELECTED DRAWING: NoneCOPYRIGHT: (C)2020,JPO&INPIT【課題】リン吸着能が高く安全に使用可能な、多孔性中空糸膜を有する血液浄化器の提供。【解決手段】無機イオン吸着体を含む中空糸膜を有する血液浄化器であって、牛血清に生理食塩水を加えて総タンパク質濃度を６．５ｇ／ｄＬに調整した原液を、中空糸膜に６０分間通液し、膜間圧力差２５ｍｍＨｇの圧力下で濾液を採取し、アルブミンの濃度をＢＣＧ法で測定するとき、式（１）：アルブミン透過率（％）＝濾液のアルブミン濃度／原液のアルブミン濃度×１００で表されるアルブミンの透過率が５％以下であり、かつ、血液浄化器内に注射用生理食塩液を封入してから３月後及び６月後における該注射用生理食塩液１ｍＬ中の１０μｍ以上の微粒子数が２５個以下であり、かつ、２５μｍ以上の微粒子数が３個以下であることを特徴とする血液浄化器。【選択図】なし
