The inside of the eye to be inspected is widely observed while reducing the burden on the subject having the eye to be inspected. From the pupil (Pp) side of the eye to be inspected (12), the spread of the light flux is suppressed by the first refracting surface in the order in which light is incident, and the light is reflected by the first reflecting surface (Mr01) having the central opening, and the eye to be inspected (12). ) Is directed toward the eye (12) and is reflected by the second reflecting surface (Mr02) in the direction opposite to the direction toward the subject's eye (12), and passes through the central opening of the first reflecting surface. An image of a pupil conjugate (Pcj) that is image conjugate with the position of the pupil (Pp) of the optometry (12) is formed. The first refracting surface ensures a sufficient working distance, enables downsizing of the first reflecting surface (Mr01), and allows the openings of the second reflecting surface (Mr02) and the first reflecting surface (Mr01) to pass through. Thereby, the light beams can be separated. Therefore, by making the first reflecting surface (Mr01) concave and the second reflecting surface (Mr02) convex, the optical system can be downsized.被検眼を有する対象者に対する負担を軽減しつつ被検眼内を広範囲に観察する。 被検眼（１２）の瞳（Ｐｐ）側より、光が入射する順に第１屈折面により光束の広がりを抑制した上で中心開口を有する第１反射面（Ｍｒ０１）により反射され、被検眼（１２）へ向かう方向で、かつ収束方向に光束が向かい、第２反射面（Ｍｒ０２）で被検眼（１２）へ向かう方向と逆方向に反射されて、第１反射面の中心開口を透過し、被検眼（１２）の瞳（Ｐｐ）位置と像共役となる瞳共役（Ｐｃｊ）の像が形成される。第１屈折面により、十分な作動距離が確保され、第１反射面（Ｍｒ０１）の小型化が可能とされ、第２反射面（Ｍｒ０２）及び第１反射面（Ｍｒ０１）の開口部を透過させることにより、光束分離が可能になるので、第１反射面（Ｍｒ０１）を凹面形状、及び第２反射面（Ｍｒ０２）を凸面形状とすることで、光学系を小型化できる。
