To make it possible to obtain a tomographic image with an excellent contract even if the measured object is out of the optical path length adjustable range of the apparatus.SOLUTION: Determination means for determining whether or not an in-focus state is obtained by position change in a position changing range of a focusing member allowed by in-focus position changing means and control means for operating alignment means depending upon the determination result of the determination means are provided for an ophthalmologic apparatus, which comprises: tomographic image acquisition means for acquiring a tomographic image of an examined object based on multiplexed light in which return light from the examined object irradiated with measuring light is multiplexed with reference light corresponding to the measuring light； the in-focus position changing means for changing the position of a focusing member to obtain an in-focus state of the measuring light with which the examined object is irradiated； the alignment means for alignment by changing the position of an optical head having the focusing member relative to the examined object； and optical path length difference changing means for changing the difference in optical path length between the measuring light and the reference light.SELECTED DRAWING: Figure 3【課題】被測定物が装置の光路長調整範囲の範囲外であっても、コントラストの良い断層像を容易に得る。【解決手段】測定光を照射した被検査物からの戻り光と測定光に対応する参照光とを合波した合波光に基づいて被検査物の断層画像を取得する断層画像取得手段と、被検査物に対する測定光の合焦状態を得るために合焦部材の位置を変更する合焦位置変更手段と、合焦部材を有する光学ヘッドと被検査物との相対位置を変化させて位置合わせを行う位置合わせ手段と、測定光と参照光との光路長差を変更する光路長差変更手段と、を有する眼科装置において、合焦位置変更手段による合焦部材の位置変更範囲の内での位置変更にて合焦状態が得られるか否かを判断する判断手段と、判断手段の判断結果に応じて位置合わせ手段を動作させる制御手段と、を配する。【選択図】図３
