AUTOMATIC ANALYZER

PURPOSE:To prevent the deterioration in the detection accuracy by arranging a reaction cell array group having a plurality of reaction cells and an injector of a sample and a reagent and an absorbancy measuring device at a specified position of the reaction cell array group. CONSTITUTION:An automatic analyzer has seventy two reaction cells so arranged in a circle to compose a reaction cell 5 array block. A sample SI9 and a sample SII10 are injected into a reaction cells 5 placed at the position 1. A first sample 20 is injected into the reaction cells placed at the position 1' with a dispensor 18. A second reagent 19 is injected to the reaction cells 5 placed at the position 13 with a reagent distributor 17. Thus, this invention can provide an apparatus free from deterioration in the detection accuracy regardless of any attempt for increasing the number of the reaction cells.