An automatic analyzer comprising: an incubator that includes a plurality of holding portions holding a plurality of reaction containers and promotes a reaction of a mixed solution of a sample and a reagent, the reaction containers containing the mixed solution; a receiving unit that receives analysis information relating to a measurement item of the sample; a transport unit that transports each of the reaction containers to the holding portion; an analyzing unit (1-7, 2-1) that performs analysis by operating a measurement sequence of a predetermined reaction time on each of the reaction containers containing the mixed solution to which a predetermined reagent is added at a predetermined timing based on the analysis information; and a planning unit that creates an analysis schedule to be performed by the analyzing unit (1-7, 2-1) based on the analysis information, wherein in an analysis of a plurality of different measurement items, the planning unit estimates and creates the analysis schedule according to a plurality of different measurement sequences such that the different measurement sequences are capable of being performed, characterized in that the automatic analyzer further comprises a request analyzing unit that analyzes, in a case where a new measurement request is received, the measurement request, calculates a ratio of the different measurement sequences, and updates a setting of an empty cycle of the analysis schedule based on the calculated ratio, the planning unit creates the analysis schedule according to the ratio calculated by the request analyzing unit, and the different measurement sequences include a short measurement item and a standard measurement item, the short measurement item being a measurement item that requires a short period of time for a reaction, and the standard measurement item being a measurement item that requires a standard period of time for a reaction, and the ratio is a proportion of the short measurement items with respect to the standard measurement items. an incubator that includes a plurality of holding portions holding a plurality of reaction containers and promotes a reaction of a mixed solution of a sample and a reagent, the reaction containers containing the mixed solution; a receiving unit that receives analysis information relating to a measurement item of the sample; a transport unit that transports each of the reaction containers to the holding portion; an analyzing unit (1-7, 2-1) that performs analysis by operating a measurement sequence of a predetermined reaction time on each of the reaction containers containing the mixed solution to which a predetermined reagent is added at a predetermined timing based on the analysis information; and a planning unit that creates an analysis schedule to be performed by the analyzing unit (1-7, 2-1) based on the analysis information, wherein in an analysis of a plurality of different measurement items, the planning unit estimates and creates the analysis schedule according to a plurality of different measurement sequences such that the different measurement sequences are capable of being performed, characterized in that the automatic analyzer further comprises a request analyzing unit that analyzes, in a case where a new measurement request is received, the measurement request, calculates a ratio of the different measurement sequences, and updates a setting of an empty cycle of the analysis schedule based on the calculated ratio, the planning unit creates the analysis schedule according to the ratio calculated by the request analyzing unit, and the different measurement sequences include a short measurement item and a standard measurement item, the short measurement item being a measurement item that requires a short period of time for a reaction, and the standard measurement item being a measurement item that requires a standard period of time for a reaction, and the ratio is a proportion of the short measurement items with respect to the standard measurement items.