A visual performance examination device comprising: an image data obtaining unit that obtains image data of right eye and image data of left eye of a test subject who is irradiated with a detection light emitted from a light source; a position calculating unit that based on the image data of the right eye, calculates first-type relative position data indicating relative position between pupil and corneal reflex of the right eye, and based on the image data of the left eye, calculates second-type relative position data indicating relative position between pupil and corneal reflex of the left eye; and an evaluating unit that, based on the first-type relative position data and the second-type relative position data, outputs evaluation data about visual performance of the test subject, wherein the first-type relative position data contains time-series data of relative positions between the pupil and the corneal reflex of the right eye in a specified time period, the second-type relative position data contains time-series data of relative positions between the pupil and the corneal reflex of the left eye in the specified time period, and the evaluating unit outputs the evaluation data based on variation in the relative positions between the pupil and the corneal reflex of the right eye in the specified time period, and variation in the relative positions between the pupil and the corneal reflex of the left eye in the specified time period, wherein based on the first-type relative position data and the second-type relative position data in the specified time period, the position calculating unit calculates time-series data of distances D between corneal reflex of the right eye and corneal reflex of the left eye when position of the pupil of the right eye and position of the pupil of the left eye are set to be coincident in a predetermined plane, and the evaluating unit outputs the evaluation data based on representative value of the distances D within the specified time period. an image data obtaining unit that obtains image data of right eye and image data of left eye of a test subject who is irradiated with a detection light emitted from a light source; a position calculating unit that based on the image data of the right eye, calculates first-type relative position data indicating relative position between pupil and corneal reflex of the right eye, and based on the image data of the left eye, calculates second-type relative position data indicating relative position between pupil and corneal reflex of the left eye; and based on the image data of the right eye, calculates first-type relative position data indicating relative position between pupil and corneal reflex of the right eye, and based on the image data of the left eye, calculates second-type relative position data indicating relative position between pupil and corneal reflex of the left eye; and an evaluating unit that, based on the first-type relative position data and the second-type relative position data, outputs evaluation data about visual performance of the test subject, wherein the first-type relative position data contains time-series data of relative positions between the pupil and the corneal reflex of the right eye in a specified time period, the second-type relative position data contains time-series data of relative positions between the pupil and the corneal reflex of the left eye in the specified time period, and the evaluating unit outputs the evaluation data based on variation in the relative positions between the pupil and the corneal reflex of the right eye in the specified time period, and variation in the relative positions between the pupil and the corneal reflex of the left eye in the specified time period, variation in the relative positions between the pupil and the corneal reflex of the right eye in the specified time period, and variation in the relative positions between the pupil and the corneal reflex of the left eye in the specified time period, wherein based on the first-type relative position data and the second-type relative position data in the specified time period, the position calculating unit calculates time-series data of distances D between corneal reflex of the right eye and corneal reflex of the left eye when position of the pupil of the right eye and position of the pupil of the left eye are set to be coincident in a predetermined plane, and the evaluating unit outputs the evaluation data based on representative value of the distances D within the specified time period.