Automatic Analyzer

An object of the present invention is to provide an automatic analyzer that reduces the risk of reagent contamination to a human body and the risk of failures due to device components by automating the lift of an aspiration nozzle at the time of reagent exchange work. The present invention provides an automatic analyzer comprising: an installation plate on which a system reagent container is installed; a liquid aspiration unit that aspirates a reagent from the system reagent container; a support unit to which the liquid aspiration unit is coupled and which can be moved between a reagent container exchange position and a reagent aspiration position; and a lift mechanism that allows the support unit to perform a lift operation. The support unit of the liquid aspiration unit is raised to the reagent container exchange position by the lift mechanism when a first condition is satisfied, and the support unit of the liquid aspiration unit is lowered to the reagent aspiration position by the lift mechanism when a second condition is satisfied.