To enable the determination of the literally challenged people to be performed accurately by inhibiting the dexterity of subjects' fingers from influencing the result for the problem of estimating the recognition of inclination of line segments.SOLUTION: A line segment direction matching device 1 determines whether or not the subject is a literally challenged person according to the result of a direction matching of a reference line segment 3a and a movable line segment 4b moved by a subject, the direction of the movable line segment 4b is characterized by being changed by turning a rotary member 4 which can rotate around a fixing shaft 4a.SELECTED DRAWING: Figure 1
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