In order to accurately align an eye examining portion with the center of the pupil, the interval d between illumination light source images PL and PR is an interval obtained when the operation distance has been properly position-aligned by other alignment means. Fatty acids are removed as its metallic salts and carotenoids are recovered using a polar solvent. Electronic components are mounted on the first and second circuit boards. The first axial line and the second axial line are neither co-linear nor co-planar. A transmission channel estimation section estimates the transmission channel of the desired signal received by the beamformer to correct the desired signal based on the estimation result.