PROBLEM TO BE SOLVED: To provide an ophthalmologic apparatus capable of acquiring stable optical performances such as sensitivity and acquiring interference signals from which unnecessary components are favorably removed by adjusting a balance of intensities of the interference signals in a detection and securing a wide dynamic rage.SOLUTION: The ophthalmologic apparatus includes a balance type optical detector 124 consisting of a first photo detector 124a and a second photo detector 124b for detecting interference light obtained by multiplexing reference light divided from light from a wavelength sweeping light source 102 and measurement light via a subject's eye E. The balance type optical detector 124 includes adjustment means for adjusting balance of intensities of a first interference signal in the first photo receptor 124a and a second interference signal in the second photo receptor 124b.
