PURPOSE: To distribute samples accurately through simple operation by providing a sample container, an excessive sample container, and plural distribution containers, and connecting them through piping and valves.

CONSTITUTION: All main valves 2, 3, 12, 22, 32, and 42 are closed while the sample container 1 contains a liquid sample. Then, the main valve 3 is opened to fill pipes 51W54 with the liquid sample and an excessive sample is recovered in the excessive sample recovery container 11 by opening the main valve 12. In this state, there is no sample in the pipe 51. Then, the main valves 22, 32, and 42 are opened successively to distribute a specific amount of the sample to the distribution containers 21, 31, and 41.