Automatic analyzing apparatus

An automatic analyzing apparatus comprising means for transferring a reaction vessel along a given traveling path in a stepwise manner pitch by pitch;

• means arranged on the traveling path at a reagent distribution position for distributing a reagent corresponding to a measurement item to be tested into the reaction vessel transferred into the reagent distribution position;
• means arranged on the traveling path at a sample distribution position which is downstream with respect to said reagent distribution position, said sample being distributed into the reaction vessel to form a reaction liquid;
• a first photometric unit arranged on the traveling path at a position between the reagent distribution position and the sample distribution position for measuring an absorption degree of the reaction vessel and the reagent contained in the reaction vessel;
• a second photometric unit arranged on the traveling path at a downstream position with respect to said sample distribution position for measuring an absorption degree of the reaction liquid through the reaction vessel;
• means for correcting the absorption degree of the reaction liquid on the basis of the absorption degree of the reaction vessel and the reagent to derive a corrected absorption degree of the reaction liquid alone;
• means arranged on the traveling path at an upstream position with respect to said reagent distribution position for supplying new reaction vessels onto the reaction vessel transferring means;
• and
• means arranged on the traveling path at a downstream position with respect to the second photometric unit for removing the reaction vessels containing the reaction liquids from the traveling path.