Abstract: A data generation device is a data generation device that generates determination data for determining a state of a target object. The data generation device includes: a first acquirer that acquires, from a first sensor, measurement data obtained by measuring the target object; a second acquirer that acquires, from a second sensor different from the first sensor, first factor data obtained by measuring a first noise factor that may cause noise in the measurement data; an accuracy information generator that calculates a measurement accuracy level of the measurement data based on the first factor data; and an accuracy information combiner that outputs the determination data in which the measurement data is associated with accuracy information indicating the measurement accuracy level of the measurement data.