PROBLEM TO BE SOLVED: To provide a dominant eye test system for diagnosing a dominant eye of a subject easily in a short time.SOLUTION: A first stimulus 101 is configured to be visually recognized by only the left eye of the subject, a second stimulus 102 is configured to be visually recognized by only the right eye of the subject, a third stimulus 103 is displayed to connect the first stimulus 101 and the second stimulus 102, and the subject recognizes as if the third stimulus 103 extends from one stimulus seen by a dominant eye to the other stimulus, due to a visual illusion. When a length extending from a display position of the first stimulus 101 toward a display position of the second stimulus 102 is longer than a length extending from the display position of the second stimulus 102 to the display position of the first stimulus 101, the subject has a visual illusion in which the third stimulus 103 appears to collide at a collision point 120 near the second stimulus 102 relative to the first stimulus 101, and the test shows the left eye is the dominant eye, in this case.
