Abstract: A small automatic analyzer in which a specimen disc 12 and a reagent disc 22 are disposed at different positions in a depth direction in a this-side area of an upper surface of an analyzer housing 40, a reaction disc 3 is disposed backward from the specimen disc 12 between the specimen disc 12 and the reagent disc 22, a specimen extracting and injecting unit 14 is disposed between the reaction disc 3 and the specimen disc 12, a reagent extracting and injecting unit 24 is disposed between the reaction disc 3 and the reagent disc 22, the specimen and reagent extracting and injecting units 14 and 24 are arranged at different positions in an oblique direction, the reaction disc 3, specimen disc 12 and reaction disc 22 each have a separate cover therefor, and the specimen extracting and injecting unit 14 and the specimen extracting and injecting unit 24 have a common cover therefor.

Abstract: In an automatic analyzing apparatus for analyzing multi-analysis items in regard to biological samples, a reaction disk, on which a lot of reaction containers are arranged, is repeatedly rotated by one rotation plus one pitch and stopped for receiving a reagent, and intermediately pauses twice between the stops without delivering reagents. The apparatus is so set that a third reagent for the latest delivery timing is delivered during a stop for receiving a sample at a single reagent delivering position E, and a first and a second reagent are delivered during the intermediate pauses at the single reagent delivering position E. After delivering a sample to a specified reaction container, the reaction container is delivered with the first reagent during an intermediate pause in a first cycle and the second reagent during an intermediate pause in a cycle after the delivery of the first reagent, and then the third reagent during a stop for receiving a sample in a cycle after the delivery of the second reagent.

Abstract: Before analysis, the correspondence between the vessel positions and the reaction vessels held in the vessel positions respectively at the time of completion of all the operations of a turntable upon completion of the last analysis are stored in a computer in advance. When a start switch is turned on, a judgment is made as to whether the correspondences between the vessel positions and the reaction vessels coincide with those stored in the computer or not. In the case of coincidence, reaction vessels in vessel positions are regarded as having been already cleaned, so that these reaction vessels are subjected to blank measurement and sample addition in the case of optical measurement, whereas these reaction vessels are directly subjected to sample addition in the case of ISE measurement.