Provided is a blood purification device including a porous molded body that has a high phosphorus adsorption capacity and that can be used safely. A blood purification device includes a porous molded body containing an inorganic ion-adsorbing material and is characterized by the following: said blood purification device satisfies the relationship B=−0.02 A+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 μm or more is 25 or less and the number of fine particles having a size of 25 μm 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.