A blood sample processing apparatus comprising: a rotation driver; a container holder configured to secure a sample container that contains a blood sample, the sample container having a lid, the container holder coupled to the rotation driver, said rotation driver configured to longitudinally rotate the sample container; a sample aspirator wherein the sample aspirator includes an aspiration tube that is configured to aspirate the blood sample in the sample container and a penetration driver that is configured to force the aspiration tube to penetrate said lid, wherein the sample aspirator is configured to aspirate the blood sample in the sample container; and a controller configured to operate the rotation driver and the sample aspirator, so as to command the rotation driver to repeatedly perform an inclining-stirring cycle, wherein each cycle includes a first process and a second process, respectively, wherein in the first process, the sample container is initially held in a first state in which a bottom portion of the sample container is positioned lower than the lid and then rotated to a second state in which the bottom portion of the sample container is positioned at least as high as the lid, and wherein in the second process, the sample container is moved from the second state to the first state; wherein the controller is further configured to command the sample aspirator to aspirate the blood sample in the sample container after the second process of the final inclining-stirring cycle, and wherein the controller is also configured to command the penetration driver to force the aspiration tube to penetrate said, after the second process of the final inclining-stirring operation; characterised in that: the controller is further configured to command the rotation driver to perform the second process of the final inclining stirring cycle to be carried out for a longer time than the other second processes; and in that the aspiration tube has a groove in an outer circumferential surface extending in a longitudinal direction of the aspiration tube. a rotation driver; a container holder configured to secure a sample container that contains a blood sample, the sample container having a lid, the container holder coupled to the rotation driver, said rotation driver configured to longitudinally rotate the sample container; a sample aspirator wherein the sample aspirator includes an aspiration tube that is configured to aspirate the blood sample in the sample container and a penetration driver that is configured to force the aspiration tube to penetrate said lid, wherein the sample aspirator is configured to aspirate the blood sample in the sample container; and a controller configured to operate the rotation driver and the sample aspirator, so as to command the rotation driver to repeatedly perform an inclining-stirring cycle, wherein each cycle includes a first process and a second process, respectively, wherein in the first process, the sample container is initially held in a first state in which a bottom portion of the sample container is positioned lower than the lid and then rotated to a second state in which the bottom portion of the sample container is positioned at least as high as the lid, and wherein in the second process, the sample container is moved from the second state to the first state; wherein the controller is further configured to command the sample aspirator to aspirate the blood sample in the sample container after the second process of the final inclining-stirring cycle, and wherein the controller is also configured to command the penetration driver to force the aspiration tube to penetrate said, after the second process of the final inclining-stirring operation; characterised in that: the controller is further configured to command the rotation driver to perform the second process of the final inclining stirring cycle to be carried out for a longer time than the other second processes; and in that the aspiration tube has a groove in an outer circumferential surface extending in a longitudinal direction of the aspiration tube.