A device for capturing a target including any one of: microbes selected from bacteria, fungus, protozoa, and viruses; cells; biomedical tissue; and biopolymers, the target contained in a liquid, the device including: a predetermined amount of irregular-shaped powdery grains made of a pulverizable adsorbent resin and distributed in a grain size range from 30μm to 100μm and which can be suspended in a liquid and can absorb or bond to said target an irregular-shaped powdery-grains holding section that allows passage of a liquid and holds the irregular-shaped powdery grains so as to be able to come in contact with the passing liquid; and a container that receives said liquid having passed through said irregular-shaped powdery-grains holding section, wherein said irregular-shaped powdery-grains holding section is provided in a flow channel having two ports for respectively performing suction and discharge and includes two filters configured to partition the flow channel interior, the filters having a pore diameter smaller than said grain size range of said irregular-shaped powdery grains, and said irregular-shaped powdery grains are provided so as to be placed between the two filters, wherein freedom of said powdery grains held in layers is decreased by decreasing the distance between the filters for a case where the concentration of adsorbed or bound targets is small so that clogging does not occur in the irregular-shaped powdery-grains holding section, and wherein the freedom of said powdery grains held in layers is increased by increasing the distance between the filters for a case where the concentration of adsorbed or bound targets is large so as to cause clogging in the irregular-shaped powdery-grains holding section. a predetermined amount of irregular-shaped powdery grains made of a pulverizable adsorbent resin and distributed in a grain size range from 30μm to 100μm and which can be suspended in a liquid and can absorb or bond to said target an irregular-shaped powdery-grains holding section that allows passage of a liquid and holds the irregular-shaped powdery grains so as to be able to come in contact with the passing liquid; and a container that receives said liquid having passed through said irregular-shaped powdery-grains holding section, wherein said irregular-shaped powdery-grains holding section is provided in a flow channel having two ports for respectively performing suction and discharge and includes two filters configured to partition the flow channel interior, the filters having a pore diameter smaller than said grain size range of said irregular-shaped powdery grains, and said irregular-shaped powdery grains are provided so as to be placed between the two filters, wherein freedom of said powdery grains held in layers is decreased by decreasing the distance between the filters for a case where the concentration of adsorbed or bound targets is small so that clogging does not occur in the irregular-shaped powdery-grains holding section, and wherein the freedom of said powdery grains held in layers is increased by increasing the distance between the filters for a case where the concentration of adsorbed or bound targets is large so as to cause clogging in the irregular-shaped powdery-grains holding section.