An automatic analyzer comprising: a light source configured to irradiate a reaction container in which a sample is accommodated with light, an optical detection means (204, 205, 206, 301) configured to detect the light which has passed through the reaction container, and an arithmetic processing unit configured to analyze the sample in the reaction container on the basis of the detected light, wherein: the detection means (204, 205, 206, 301) has a plurality of optical detection elements (204, 205, 206) that are arranged at respective different angles with respect to the light source; and characterized in that the arithmetic processing unit is configured to: calculate reference data on the basis of a plurality of measurement signals measured by one detection element (204, 205, 206) selected from among the plurality of detection elements (204, 205, 206), wherein the reference data are calculated by approximating measurement signals obtained from the selected one detection element (204, 205, 206); then calculate degrees of variability of the plurality of measurement signals of the selected one detection element (204, 205, 206) with respect to the calculated reference data respectively, and correct a plurality of measurement signals of a detection element (204, 205, 206) which differs from the selected one detection element (204, 205, 206), on the basis of the calculated degrees of variability, wherein the plurality of measurement signals of each respective detection element (204, 205, 206) of the plurality of detection elements (204, 205, 206) differ in detection time from one another; and whereby the sample is analyzed on the basis of the corrected measurement signal. a light source configured to irradiate a reaction container in which a sample is accommodated with light, an optical detection means (204, 205, 206, 301) configured to detect the light which has passed through the reaction container, and an arithmetic processing unit configured to analyze the sample in the reaction container on the basis of the detected light, wherein: the detection means (204, 205, 206, 301) has a plurality of optical detection elements (204, 205, 206) that are arranged at respective different angles with respect to the light source; and characterized in that the arithmetic processing unit is configured to: calculate reference data on the basis of a plurality of measurement signals measured by one detection element (204, 205, 206) selected from among the plurality of detection elements (204, 205, 206), wherein the reference data are calculated by approximating measurement signals obtained from the selected one detection element (204, 205, 206); then calculate degrees of variability of the plurality of measurement signals of the selected one detection element (204, 205, 206) with respect to the calculated reference data respectively, and correct a plurality of measurement signals of a detection element (204, 205, 206) which differs from the selected one detection element (204, 205, 206), on the basis of the calculated degrees of variability, wherein the plurality of measurement signals of each respective detection element (204, 205, 206) of the plurality of detection elements (204, 205, 206) differ in detection time from one another; and whereby the sample is analyzed on the basis of the corrected measurement signal. the detection means (204, 205, 206, 301) has a plurality of optical detection elements (204, 205, 206) that are arranged at respective different angles with respect to the light source; and characterized in that the arithmetic processing unit is configured to: calculate reference data on the basis of a plurality of measurement signals measured by one detection element (204, 205, 206) selected from among the plurality of detection elements (204, 205, 206), wherein the reference data are calculated by approximating measurement signals obtained from the selected one detection element (204, 205, 206); then calculate degrees of variability of the plurality of measurement signals of the selected one detection element (204, 205, 206) with respect to the calculated reference data respectively, and correct a plurality of measurement signals of a detection element (204, 205, 206) which differs from the selected one detection element (204, 205, 206), on the basis of the calculated degrees of variability, wherein the plurality of measurement signals of each respective detection element (204, 205, 206) of the plurality of detection elements (204, 205, 206) differ in detection time from one another; and calculate reference data on the basis of a plurality of measurement signals measured by one detection element (204, 205, 206) selected from among the plurality of detection elements (204, 205, 206), wherein the reference data are calculated by approximating measurement signals obtained from the selected one detection element (204, 205, 206); then calculate degrees of variability of the plurality of measurement signals of the selected one detection element (204, 205, 206) with respect to the calculated reference data respectively, and correct a plurality of measurement signals of a detection element (204, 205, 206) which differs from the selected one detection element (204, 205, 206), on the basis of the calculated degrees of variability, wherein the plurality of measurement signals of each respective detection element (204, 205, 206) of the plurality of detection elements (204, 205, 206) differ in detection time from one another; and whereby the sample is analyzed on the basis of the corrected measurement signal.