Provided are: a device that is for separating/housing blood components and that can more easily and aseptically separate/house platelet-rich plasma； and a method for preparing platelet-rich plasma. The device for separating/housing blood components is provided with: a blood storage section； a component housing section for housing a component that is part of blood； and a linking tube that joins the blood storage section and the component housing section. The blood storage section has: a tube-shaped blood storage vessel； a blood lead-in pathway； and a component lead-out pathway. The component housing section has a component lead-in pathway and a metal needle.
