The present invention provides a centrifugal separation-use device capable of maintaining a centrifugal separation-use container in a clean state easily at low cost even when centrifugal separation treatment is carried out using a centrifugal separator in an unclean field. A centrifugal separation-use device 1 for collecting a target component by subjecting a solution containing multiple components to centrifugal separation treatment comprises an inner container 10 having a cylindrical section 12 for accommodating the solution and a plug 14 for hermetically sealing the cylindrical section and configured so as to accommodate the solution in a hermetically sealed state, and an outer container 20 having a support section 22 for removably accommodating the cylindrical section and a delivery section 24 for exposing part of the inner container so that the inner container can be removed, and configured so as to accommodate the inner container in a hermetically sealed state.