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 (1) for separating/housing blood components is provided with: a blood storage section (2)； a component housing section (3) for housing a component that is part of blood； and a joining tube (4) that joins the blood storage section (2) and the component housing section (3). The blood storage section (2) has: a tube-shaped blood storage vessel (21) that is flexible； a blood lead-in pathway (27) that leads blood into the blood storage vessel (21)； and a component lead-out pathway (28) that leads out a component that is part of blood from the blood storage vessel (21). The component housing section (3) has: a component lead-in pathway (37) that leads in a component that is part of blood led out from the blood storage vessel (21)； and a metal needle (371) that extends from the component lead-in pathway (37) towards the interior space of the component housing section (3) and can return the component that is part of blood housed in the component housing section (3) towards the blood storage vessel (21).本發明提供一種血液成分分離收容裝置及富含血小板血漿之製備方法，其可更簡單且在無菌條件下分離、收容富含血小板血漿。並且，本發明關於一種血液成分分離收容裝置1，具備：血液貯留部2；成分收容部3，其收容血液的一部分成分；及，連結管4，其連結血液貯留部2與成分收容部3；其中，該血液貯留部2，具有：血液貯留容器21，其為筒狀且具有可撓性；血液導入路徑27，其將血液導入至血液貯留容器21；及，成分導出路徑28，其將血液的一部分成分自血液貯留容器21導出；該成分收容部3，具有：成分導入路徑37，其導入從血液貯留容器21被導出的血液的一部分成分；及，金屬針371，其自成分導入路徑37朝向成分收容部3的內部空間延伸，且能夠將已收容於成分收容部3內的血液的一部分成分，向血液貯留容器21回送。
