A relay optics includes a positive first lens group, a positive second lens group, and a positive third lens group. The second lens group includes, closest to the object, a lens having the concave surface facing toward the object. The relay optics is configured in such a manner that a light flux passing between the second and third lens groups is a substantially-parallel light flux, and satisfies condition expressions below, where f1 represents the focal length of the first lens group, d1 represents the length from the primary image to a surface closest to the object in the first lens group, f12 represents the combined focal length of the first and second lens groups, and exp12 represents the length from an exit pupil position of an optics consisting of the first and second lens groups to a surface closest to the object in the second lens group: 1≦f1/d1≦4.3 0.16≦exp12/f12≦1.2.