PURPOSE: To obtain an automatic clinical analyzer in which the waste of a cleaning liquid is reduced by a method wherein a place in which the cleaning liquid is installed is reduced and one cleaning liquid can be utilized for cleaning of a plurality of members.

CONSTITUTION: An undiluted solution for cleaning is sucked from an undiluted- solution container 17 for cleaning by means of a nozzle for a sample 16 in a sample dispensing position so as to be discharged to a reaction cell 12. The reaction cell 12 is situated in a first reagent-dispensing position, water is discharged from a nozzle for a dispenser 26a, and a diluted cleaning liquid is prepared. The diluted cleaning liquid is sucked and discharged by the nozzle for the dispenser 26a, and the outer wall and the inner wall at the tip of the nozzle for the dispenser 26a are cleaned. The reaction cell 12 in which the diluted cleaning liquid has been put is situated in a stirring position and a second reagent-dispensing position, and a stirring probe and a nozzle for a second dispenser 26b are cleaned.