PURPOSE: To enable effective distribution of a sample into a plurality of reactor vessels by arranging two groups of distribution nozzles with multiple nozzles and a mechanism for having those nozzles inserted into and removed from a sample vessel simultaneously.

CONSTITUTION: A sample distributor 49 is arranged on the opposite side almost to the center of a turn table 42 with respect to a converying course 46. Nozzles 50 of the sample distributor 49 are communicated to a suction/drain device through a tube 51. The sample distributor 49 is so constructed that four nozzles 50 are inserted into one sample vessel while blocks 58 and 59 each have four nozzles. Then, nozzle retaining sections 60W63 are put together and the nozzles 50 are inserted into the reactor vessel 44, while being kept sucked. Ths enable sample to be distributed into a plurality of reactor vessels efficiently.