Automatic analyzer

An automatic analyzer comprising:

• a sample holding means for holding a number of samples to be analyzed and indexing successive samples into a sample sucking position;
• a sample dispensing means for dispensing samples indexed into said sample sucking position into reaction vessels;
• a reagent holding means for holding a plurality of different kinds of reagents and indexing any desired reagents into a reagent sucking position, said reagent holding means including a turn table, a driving means for rotating said turn table, a plurality of divided trays having compartments detachably arranged on said turn table, said compartments for a tray being different in number from at least one other tray, the compartments for each tray being the same or different in size, a reagent container detachably installed in each compartment, a first detector for detecting a position of said turn table to derive a position signal, and a second detector for detecting division identification marks provided on said divided trays to provide a division information signal, said division identification marks provide an indication of size and number of compartments formed in said divided trays;
• a reagent dispensing means for dispensing reagents indexed at said reagent sucking position into the reaction vessels;
• a measuring means for measuring test liquids contained in the reaction vessels after elapsing given reaction time;
• and
• a controlling means for controlling said driving means in the reagent holding means and reagent dispensing means in accordance with said position signal generated by said first detector as well as said division information signal generated by said second detectors, respectively.