An automatic analyzer comprising: a reaction disk equipped with holders each adapted to hold a reaction vessel containing a sample and a reagent, and with a drive mechanism adapted to rotationally move and stop the reaction disk, thereby moving the reaction vessels intermittently; stirring means for stirring a mixed liquid including the sample and the reagent in the reaction vessel; and control means (13, 15) for controlling the stirring means such that the stirring means applies two or more different stirring conditions to the reagent at the time of stirring the mixed liquid to which the reagent has been added, wherein the stirring means comprises a plurality of stirrers (7b-1, 7b-2; 7c-1, 7c-2, 7d-1, 7d-2), characterised in that the control means is adapted to control the automatic analyzer so that two different sets of stirring parameters are used for a single reagent wherein consecutively: the reaction vessel containing a sample and a first reagent is transferred to a first position in front of a first (7b-1; 7c-1) of the stirrers, the first stirrer performs stirring of the mixture contained in the reaction vessel with first stirring parameters (601; 701), the reaction vessel is transferred to a second position in front of a second (7b-2; 7c-2) of the stirrers, the second stirrer performs stirring of the mixture contained in the reaction vessel with second stirring parameters (602; 702), a second reagent is added to the liquid in the reaction vessel, and either the reaction vessel containing the sample and the first and second reagents is transferred to the first position in front of the first stirrer (7b-1) which performs stirring of the mixture contained in the reaction vessel with third stirring parameters and the reaction vessel is transferred to the second position in front of the second stirrer (7b-2) which performs stirring of the mixture with fourth stirring parameters, or the reaction vessel containing the sample and the first and second reagents is transferred to a third (7d-1) of the stirrers which performs stirring of the mixture contained in the reaction vessel with third stirring parameters and the reaction vessel is transferred to a fourth (7d-2) of the stirrers which performs stirring of the mixture with fourth stirring parameters. a reaction disk equipped with holders each adapted to hold a reaction vessel containing a sample and a reagent, and with a drive mechanism adapted to rotationally move and stop the reaction disk, thereby moving the reaction vessels intermittently; stirring means for stirring a mixed liquid including the sample and the reagent in the reaction vessel; and control means (13, 15) for controlling the stirring means such that the stirring means applies two or more different stirring conditions to the reagent at the time of stirring the mixed liquid to which the reagent has been added, wherein the stirring means comprises a plurality of stirrers (7b-1, 7b-2; 7c-1, 7c-2, 7d-1, 7d-2), characterised in that the control means is adapted to control the automatic analyzer so that two different sets of stirring parameters are used for a single reagent wherein consecutively: the reaction vessel containing a sample and a first reagent is transferred to a first position in front of a first (7b-1; 7c-1) of the stirrers, the first stirrer performs stirring of the mixture contained in the reaction vessel with first stirring parameters (601; 701), the reaction vessel is transferred to a second position in front of a second (7b-2; 7c-2) of the stirrers, the second stirrer performs stirring of the mixture contained in the reaction vessel with second stirring parameters (602; 702), a second reagent is added to the liquid in the reaction vessel, and either the reaction vessel containing the sample and the first and second reagents is transferred to the first position in front of the first stirrer (7b-1) which performs stirring of the mixture contained in the reaction vessel with third stirring parameters and the reaction vessel is transferred to the second position in front of the second stirrer (7b-2) which performs stirring of the mixture with fourth stirring parameters, or the reaction vessel containing the sample and the first and second reagents is transferred to a third (7d-1) of the stirrers which performs stirring of the mixture contained in the reaction vessel with third stirring parameters and the reaction vessel is transferred to a fourth (7d-2) of the stirrers which performs stirring of the mixture with fourth stirring parameters.