Provided is a blood purification device comprising a porous molded body that has a high phosphorus adsorption capacity and that can be used safely. A blood purification device according to the present invention comprises a porous molded body containing an inorganic ion-adsorbing material and is characterized by the following: said blood purification device satisfies the relationship B = -0.02A + 2.175 ± 0.185 (74 ≤ A ≤ 94) when the moisture content of the porous molded body is denoted by A and the bulk density is denoted by B； and the number of fine particles having a size of 10 [mu]m or more is 25 or less and the number of fine particles having a size of 25 [mu]m or more is 3 or less in 1 mL of a physiological saline solution for injection both three months and six months after said physiological saline solution for injection is sealed in the blood purification device.本發明提供一種磷吸附能力較高且能夠安全使用之具有多孔性成形體之血液淨化器。本發明之血液淨化器之特徵在於：其係具有包含無機離子吸附體之多孔性成形體者，且於將該多孔性成形體之含水率設為A，將鬆密度設為B時，滿足B=-0.02A+2.175±0.185(74≦A≦94)之關係，且向該血液淨化器中封入注射用生理鹽液後3個月後及6個月後，該注射用生理鹽液1 mL中之10 μm以上之微粒子數為25個以下，且25 μm以上之微粒子數為3個以下。
