To provide an optical tomographic imaging apparatus for obtaining an image as can select various imaging range of the anterior part. An image obtaining means for obtaining a tomographic image of the anterior ocular segment on the basis of the interference light obtained by combining the reference light and the measurement light reflected at A of the eye anterior segment, the optical path length of the measuring light the measuring light optical path length changing means for changing, with a focus lens to perform focusing to the anterior segment of the measuring beam, is interlocked to change the optical path length of the measurement light by the measurement optical path length changing means, focusing to the anterior segment I wearing, and a control means for executing the focus lens. [Selection Figure] Figure 4【課題】前眼部の様々な撮像範囲を選択可能として画像を得られる光断層撮像装置を提供する。【解決手段】被検眼の前眼部で反射した測定光と参照光との合波により得られる干渉光に基づいて前眼部の断層画像を取得する画像取得手段と、測定光の光路長を変更する測定光光路長変更手段と、測定光の前眼部に対する焦点合わせを行うフォーカスレンズと、測定光光路長変更手段による測定光の光路長の変更に連動させて、前眼部に対する焦点合わせをフォーカスレンズに実行させる制御手段と、を配する。【選択図】図4
