Reagent cassette and automatic analyzer using the same

An automatic analyzer comprising:

• a reagent disk;
• a plurality of reagent cassettes, each of which includes a plurality of reagent bottles used for one measurement item, being set on said reagent disk, each said reagent cassette being provided with a plurality of reagent sucking positions at predetermined locations on a top surface thereof;
• a reaction disk;
• a reaction cuvette arranged on said disk;
• a reagent pipetting probe for sucking a reagent in said reagent bottles, and adding a reagent into a sample in said reaction cuvette;
• a photometer for detecting an absorbance of said sample;
• an information reading mechanism;
• and
• a control mechanism for controlling a reagent pipetting position at said reagent disk, controlling said reagent pipetting probe to move to said reagent pipetting position to suck a reagent from said reagent bottle in said reagent cassette positioned at said reagent pipetting position and to add a sucked reagent into said reaction cuvette on said reaction disk, and converting said absorbance of said sample into a concentration of said sample,
• wherein each said reagent cassette is provided with a single information recording medium on a top surface of said cassette in which information regarding at least reagent suction positions of said reagent cassette, the presence or absence of a reagent bottle at each reagent sucking position and a size of each reagent bottle, is recorded, and said information reading mechanism is adapted to read the information recorded in the information recording medium provided on each said reagent cassette, and said control mechanism controls the reagent pipetting position in accordance with the information regarding each of the reagent suction positions read by said information reading mechanism and controls the amount of reagent sucked from each reagent bottle in accordance with the information regarding the size of each reagent bottle read by said information reading mechanism.