ABSTRACT OF THE DISCLOSURE An automatic analysis apparatus is disclosed whichprovides for various analytical operations in clinicaldiagnosis and experiments including measuring thechanges in light absorbance of a large number ofsamples mixed with different reagents in a progressivemanner, biochemical, electrolytical, fluorescence, andimmunological analysis and EIA analysis of samples inbead solid phase. A plurality of samples are maintained,together with diluents and emergency samples, in anordered sequence on a sample table rotatably disposedwhich is rotated by drive means in a stepping mannerto move the samples progressively to a predeterminedsuction position at which a sample pipetter picks upa measured amount of sample and dispenses it to one ofa plurality of reaction containers that are arrangedin an ordered sequence on a reaction table rotatablydisposed, preferably. about said sample table. A firstand a second reagent table are provided, each carryinga plurality of reagents different in kind from oneanother, selected for various analyses to be performed.A first and a second reagent pipetter are provided andoperated to pick up a measured amount of a particularreagent and mix it with any selected sample in thereaction containers. Each sample and reagent mixturemay be scanned to measure the rate of light absorbanceduring a period of time as the reaction containers isrotated on the reaction table a photometer systemincluding a rotating frame carrying thereon filtersfor different wavelengths through which the opticalbeam from a light source is passed to traverse thereaction container to be sensed by an optical sensoras the reaction container is rotated. Each reagentpipetting tube is provided with agitator means whichis operated, after each dispensing operation of thepipetting tube into the reaction container, to stirthe mixture in the reaction container into a homogenousstate for proper reaction.