An ophthalmological device emits light from a measurement optical system to an eye (100) to be examined and calculates a dimension along the eye axis of a target portion of the eye (100) from interfering light composed of reflected light from the eye (100) and reference light. The measurement optical system includes incidence a position changing member that changes the incidence position of light emitted to the eye (100), and a driving unit that drives the incidence position changing member so as to scan at the incidence position of emitted light in a predetermined region of the eye (100). The predetermined region is a region where a straight line passes through when the straight line radially extended from the cornea apex (110) of the eye (100) is circumferentially moved over a predetermined angle range in the case of the eye (100) is viewed from the front.
