A visual-line-movement-related-value-acquisition device (20, 120, 220, 320), wherein the visual-line-movement-related-value-acquisition device (20, 120, 220, 320) is configured to continuously acquire same subject's continuous data including a plurality of data related to a same subject, acquire a value related to the visual line movement of the subject as the subject's visual line movement-related value from the same subject's continuous data, and acquire, as the coordinated motion-related value, a value related to the coordinated motion of the eye motion and the head motion of the subject for the acquired subject's visual line movement-related value from the same subject's continuous data, and wherein the subject's visual line movement-related value is a visual line movement amount of the subject, wherein the coordinated motion-related value is a head motion preceding ratio that is a ratio at which a start of the head motion precedes a start of the eye motion in the coordinated motion or a motion time difference that is a time difference between a start timing of the head motion and a start timing of the eye motion in the coordinated motion, wherein the visual-line-movement-related-value-acquisition device (20, 120, 220, 320) is configured to arrange the acquired coordinated motion-related values for the subject's visual line movement-related value in an order of magnitude of the acquired subject's visual line movement-related value, extract a predetermined number of consecutive values from the coordinated motion-related values, the coordinated motion-related values being arranged in the order, calculate a representative value of the coordinated motion-related values, calculate a representative value of the subject's visual line movement-related values from the subject's visual line movement-related values, the subject's visual line movement-related values corresponding to the extracted coordinated motion-related values, and acquire the relationship between the subject's visual line movement-related value and the coordinated motion-related value from the calculated representative value of the coordinated motion-related values and the calculated representative value of the subject's visual line movement-related values, and output the subject's visual line movement-related value when the coordinated motion-related value is a predetermined value from a relationship between the acquired subject's visual line movement-related value and the acquired coordinated motion-related value. continuously acquire same subject's continuous data including a plurality of data related to a same subject, acquire a value related to the visual line movement of the subject as the subject's visual line movement-related value from the same subject's continuous data, and acquire, as the coordinated motion-related value, a value related to the coordinated motion of the eye motion and the head motion of the subject for the acquired subject's visual line movement-related value from the same subject's continuous data, and wherein the subject's visual line movement-related value is a visual line movement amount of the subject, wherein the coordinated motion-related value is a head motion preceding ratio that is a ratio at which a start of the head motion precedes a start of the eye motion in the coordinated motion or a motion time difference that is a time difference between a start timing of the head motion and a start timing of the eye motion in the coordinated motion, wherein the visual-line-movement-related-value-acquisition device (20, 120, 220, 320) is configured to arrange the acquired coordinated motion-related values for the subject's visual line movement-related value in an order of magnitude of the acquired subject's visual line movement-related value, extract a predetermined number of consecutive values from the coordinated motion-related values, the coordinated motion-related values being arranged in the order, calculate a representative value of the coordinated motion-related values, calculate a representative value of the subject's visual line movement-related values from the subject's visual line movement-related values, the subject's visual line movement-related values corresponding to the extracted coordinated motion-related values, and acquire the relationship between the subject's visual line movement-related value and the coordinated motion-related value from the calculated representative value of the coordinated motion-related values and the calculated representative value of the subject's visual line movement-related values, and output the subject's visual line movement-related value when the coordinated motion-related value is a predetermined value from a relationship between the acquired subject's visual line movement-related value and the acquired coordinated motion-related value.