A cartridge capable of making effective use of a sample is provided. A blood sample is injected into a well (21) via an injection path (41) by use of a syringe, and so forth. A roller (6), in a state as kept pressed into contact with the cartridge, is rotated rightward, whereupon an elastic member (2) undergoes elastic deformation to cause the blood sample held in the well (21), and a liquid solvent held in a well (22) to reach a well (23), and the blood sample is thereby mixed with the liquid solvent. Since the liquid solvent contains surfactant, blood cells are destroyed in the well (23). The liquid solvent reaches a well (26) via a flow path (45). At this point in time, magnetic particles held in the well (25), and a cleaning liquid held in the well (24) are merged with the mixed liquid in the well (26). A magnet (7) is shifted from a position corresponding to the well (26) to a position corresponding to the well (31) along the flow path (46), thereby separating and transferring DNA caught by the magnetic particles to the well (31). Residue inside the well (26) after removal of DNA is transferred to a well (54) by the roller. The separated biopolymers are analyzed in the cartridge.