Automatic analyzer and analysis method

An analysis method comprising:

• a step in which a carrying mechanism carries a reaction container containing a sample from a reaction container disk to a stirring mechanism and installs the reaction container in the stirring mechanism;
• a step in which the stirring mechanism, including an ultrasonic wave emission apparatus configured to emit ultrasonic waves from a piezoelectric element to a side surface of the reaction container to form a rotational flow of a liquid in the reaction container, starts to stir the sample contained in the reaction container without contacting the sample;
• a step in which a reagent dispensing mechanism intermittently discharges a reagent to the reaction container a plurality of times after the stirring mechanism starts the stirring, and the stirring mechanism stirs the liquid contained in the reaction container while the reagent dispensing mechanism stops discharging the reagent to the reaction container;
• a step in which the carrying mechanism returns the reaction container, to which the reagent is discharged, from the stirring mechanism to the reaction container disk;
• a step in which a detector measures a light emission amount of the reagent;
• and
• a step in which a controller controls analysis of the light emission amount of the reagent;
• wherein a stirring speed of the stirring mechanism is controlled by controlling an intensity of ultrasonic waves emitted to the reaction container, and the stirring mechanism stirs the liquid contained in the reaction container such that a relation of UN≤UN+1 is established, where UN represents a first stirring speed performed after the reagent dispensing mechanism discharges the reagent N times and UN+1 represents a second stirring speed performed after the reagent dispensing mechanism discharges the reagent (N+1) times.