PURPOSE: To allow the selective adsorption away of a contrast medium without removing useful materials, such as albumin and immune globulin by constituting the contrast medium adsorber of a water-insoluble porous body having a carbide surface.

CONSTITUTION: A cap 6 having a bodily fluid introducing port 5 is screwed via a packing 4 extended with a filter 3 on the inner side to the aperture at one end of a cylinder 2 of an adsorbing device 1. A gap 8 having a bodily fluid leading out port 7 is screwed via a packing 4' extended with a filter 3' on the inner side to an aperture at the other end of the cylinder 2 to form a container. The contrast medium adsorber consisting of the water-insoluble porous body having the carbide surface, such as spherical active carbon of a petroleum pitch system, is packed and held between the filters 3 and 3' to form an adsorber chamber 9. The blood taken out of the inside of the body is directly passed through the adsorbing device 1 and is thereby purified. The contrast medium in the bodily fluid is selectively adsorbed away at a high rate in this way.