1. An automated analyzer comprising: a reaction container; first dispense means for dispensing a sample to the reaction container; second dispense means for dispensing a reagent to be reacted with the sample dispensed to the reaction container; stir means for mixing the sample and the reagent in the reaction container; a measurement unit that acquires a plurality of measurement point data in a reaction process of the sample and the reagent; a data processing unit that processes the measurement point data; a storage unit that stores a function used in the data processing unit; and an output unit that outputs a processing result of the data processing unit, wherein the data processing unit selects one of a plurality of approximation formulas stored in the storage unit to approximate the plurality of measurement point data and uses an index obtained from an approximated curve to determine abnormality of measurement.