An ophthalmological device comprising: a ring image photographic optical system (28, 30, 32, 40) configured to radiate a plurality of concentric ring light (L1 to L6) to a cornea surface of an eye to be examined and take reflected images of the plurality of ring light (L1 to L6) reflected from the cornea surface of the eye; an interference optical system (10, 12, 14, 16, 18, 20, 22, 24, 30, 32, 36, 38) configured to radiate measurement light to the eye, and detect interfering light composed of reflected light of the measurement light reflected from the eye and predetermined reference light, the interference optical system (10, 12, 14, 16, 18, 20, 22, 24, 30, 32, 36, 38) being further configured to change an incident position of the measurement light radiated to the eye; a processor configured to calculate a posterior surface shape of the cornea of the eye based on an anterior surface shape of the cornea of the eye and thicknesses of the cornea at a plurality of the incident positions, wherein the anterior surface shape of the cornea of the eye is determined based on the reflected images of the plurality of ring light (L1 to L6) obtained in the ring image photographic optical system (28, 30, 32, 40), and the thicknesses of the cornea at the incident positions are determined based on the interfering light at the incident positions obtained in the interference optical (10, 12, 14, 16, 18, 20, 22, 24, 30, 32, 36, 38) system, the interference optical system (10, 12, 14, 16, 18, 20, 22, 24, 30, 32, 36, 38) comprises an optical member configured to radiate the measurement light such that the measurement light enters the eye parallel to an optical axis of the ophthalmological device while the incidence position of the measurement light is changed by the interference optical system (10, 12, 14, 16, 18, 20, 22, 24, 30, 32, 36, 38), the ophthalmological device further comprising: an incident position sensor configured to detect the incident position of the measurement light that is changed by the interference optical system (10, 12, 14, 16, 18, 20, 22, 24, 30, 32, 36, 38); and a mirror configured to split the measurement light into light radiated to the eye and light radiated to the incident position sensor, wherein the incident position sensor is configured to detect the incident position of the measurement light to the eye from the light radiated to the incident position sensor. a ring image photographic optical system (28, 30, 32, 40) configured to radiate a plurality of concentric ring light (L1 to L6) to a cornea surface of an eye to be examined and take reflected images of the plurality of ring light (L1 to L6) reflected from the cornea surface of the eye; an interference optical system (10, 12, 14, 16, 18, 20, 22, 24, 30, 32, 36, 38) configured to radiate measurement light to the eye, and detect interfering light composed of reflected light of the measurement light reflected from the eye and predetermined reference light, the interference optical system (10, 12, 14, 16, 18, 20, 22, 24, 30, 32, 36, 38) being further configured to change an incident position of the measurement light radiated to the eye; a processor configured to calculate a posterior surface shape of the cornea of the eye based on an anterior surface shape of the cornea of the eye and thicknesses of the cornea at a plurality of the incident positions, wherein the anterior surface shape of the cornea of the eye is determined based on the reflected images of the plurality of ring light (L1 to L6) obtained in the ring image photographic optical system (28, 30, 32, 40), and the thicknesses of the cornea at the incident positions are determined based on the interfering light at the incident positions obtained in the interference optical (10, 12, 14, 16, 18, 20, 22, 24, 30, 32, 36, 38) system, the interference optical system (10, 12, 14, 16, 18, 20, 22, 24, 30, 32, 36, 38) comprises an optical member configured to radiate the measurement light such that the measurement light enters the eye parallel to an optical axis of the ophthalmological device while the incidence position of the measurement light is changed by the interference optical system (10, 12, 14, 16, 18, 20, 22, 24, 30, 32, 36, 38), the ophthalmological device further comprising: an incident position sensor configured to detect the incident position of the measurement light that is changed by the interference optical system (10, 12, 14, 16, 18, 20, 22, 24, 30, 32, 36, 38); and a mirror configured to split the measurement light into light radiated to the eye and light radiated to the incident position sensor, an incident position sensor configured to detect the incident position of the measurement light that is changed by the interference optical system (10, 12, 14, 16, 18, 20, 22, 24, 30, 32, 36, 38); and a mirror configured to split the measurement light into light radiated to the eye and light radiated to the incident position sensor, wherein the incident position sensor is configured to detect the incident position of the measurement light to the eye from the light radiated to the incident position sensor.