AUTOMATED ANALYZER

PROBLEM TO BE SOLVED: To provide an automated analyzer capable of improving dispensation accuracy of dispenser associated with dispensation of minute amount and of reducing a reagent volume to be wasted.SOLUTION: An automated analyzer comprises: a nozzle 31 for discharging pretreatment liquid added at the time of pretreatment of reagent or sample; a reagent container 25 for holding the reagent or the pretreatment liquid; a channel for connecting the reagent container 25 and the nozzle 31; a pump mechanism 24 that is arranged in the channel for flowing the reagent or the pretreatment liquid in the channel; a movable valve 28 that is arranged between the pump mechanism 24 and the nozzle 31 for opening and closing the channel; a movable valve 26 that is arranged between the pump mechanism 24 and the reagent container 25 for opening and closing the channel; and a control unit for controlling the movable valve 26, the movable valve 28 and the pump mechanism 24 at the operation time of adding the reagent or the pretreatment liquid to the sample so that the pump mechanism 24 flows the reagent in a discharging direction of the reagent or the pretreatment liquid to the side of the reagent container 25, in association with preliminary operation other than the addition of the reagent or the pretreatment liquid to the sample.