To facilitate the search of a specimen rack by an operator by storing the housing designation where a housing unit is registered, and designating beforehand the housing designation of the specimen rack, on the basis of the instruction from a host computer to house it.

This system is formed of an input unit 1, a housing unit 7, a centrifugal unit 2 between them, a plug opening unit 3, a dispensing unit 4, a plugging unit 5, and a classifying unit 6. In this system, the processing unit to be stopped over is preset for each every specimen rack, the carrying is performed according to it, and the housing place is fixed every stopping manner. The stopping manner is set up to four, or processing type A15, processing type B16, processing type C17, and processing type D18. As a result of this, a means capable of designating the tray to house and detecting the tray replacement is provided, and the housing designation retrieval function for the specimen is further added, so that the specimen rack can be retrieved easily.