An automatic analyzer, comprising: a specimen-container holding section that holds a specimen container storing a specimen; a reagent-container holding section (4,5) that holds a reagent container (24, 25) storing a first reagent and a second reagent; a reaction-container holding section that holds a reaction container in which the first reagent and second reagent taken out from the reagent container are added to the specimen taken out from the specimen container to cause reaction; a measuring section that measures an optical property of the specimen in the reaction container to output a measurement result; and a display control section configured to create a display screen for a measurement-data graph indicating a change over time in measurement data measured by the measuring section, or for a measurement-data list indicating a list of the measurement data, the automatic analyzer characterized in that the display control section is further configured to add, to the display screen, a display indicating the timing when the first reagent is added to the reaction container and/or the timing when the second reagent is added to the reaction container; wherein the display control section is configured to display, on the display screen: a first button for selecting on or off of a display indicating the timing the first reagent has been added, and a second button for selecting on or off of a display indicating the timing the second reagent has been added; and wherein the display control section is configured to individually display, on the display screen, the display indicating the timing the first reagent has been added and/or the display indicating the timing the second reagent has been added. a specimen-container holding section that holds a specimen container storing a specimen; a reagent-container holding section (4,5) that holds a reagent container (24, 25) storing a first reagent and a second reagent; a reaction-container holding section that holds a reaction container in which the first reagent and second reagent taken out from the reagent container are added to the specimen taken out from the specimen container to cause reaction; a measuring section that measures an optical property of the specimen in the reaction container to output a measurement result; and a display control section configured to create a display screen for a measurement-data graph indicating a change over time in measurement data measured by the measuring section, or for a measurement-data list indicating a list of the measurement data, the automatic analyzer characterized in that the display control section is further configured to add, to the display screen, a display indicating the timing when the first reagent is added to the reaction container and/or the timing when the second reagent is added to the reaction container; wherein the display control section is configured to display, on the display screen: a first button for selecting on or off of a display indicating the timing the first reagent has been added, and a second button for selecting on or off of a display indicating the timing the second reagent has been added; and a first button for selecting on or off of a display indicating the timing the first reagent has been added, and a second button for selecting on or off of a display indicating the timing the second reagent has been added; and wherein the display control section is configured to individually display, on the display screen, the display indicating the timing the first reagent has been added and/or the display indicating the timing the second reagent has been added.