In optical tomographic imaging device of the invention relates anterior segment of the eye, the examiner is possible to select a variety of imaging range. An interference optical system to be received by the light receiving element the interference light obtained from the reference light [SOLUTION] measuring light, an image acquisition device which acquires a tomographic image based on the output signal of the light receiving element, the optical path length of the measuring light In the apparatus having a measuring light optical path length changing means for changing, and a reference light optical path length changing means for changing the optical path length of the reference light, and further by linking the change of the optical path length of the measurement light by the measurement optical path length changing means I hi-control means for executing the change of the optical path length of the reference light to the reference light optical path length changing means Te. [Selection Figure Figure 4【課題】前眼部の光断層撮像装置において、検者が様々な撮像範囲を選択可能とする。【解決手段】測定光と参照光とより得られる干渉光を受光素子に受光させる干渉光学系と、受光素子の出力信号に基づいて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、参照光の光路長を変更する参照光光路長変更手段と、を有する装置において、更に、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参照光光路長変更手段に参照光の光路長の変更を実行させる制御手段を配する。【選択図】図4
