PROBLEM TO BE SOLVED: To provide an optical tomographic imaging device capable of keeping a polarization state without moving a measurement light source by simplifying a drive mechanism, and capable of suppressing loss or an aberration of light.SOLUTION: An optical tomographic imaging device acquires a tomographic image of an examined object on the basis of light obtained by wave-combining return light from the examined object irradiated with measurement light through a scanning part and reference light corresponding to the measurement light. The optical tomographic imaging device has: a division part dividing light emitted from the light source into the measurement light and the reference light and a focusing part disposed between the division part and the scanning part in an optical path of the measurement light. The optical tomographic imaging device makes optical path branch means through which the measurement light is transmitted when radiating the measurement light onto an examined eye leave from the optical path.COPYRIGHT: (C)2015,JPO&INPIT【課題】 駆動機構を簡素化し測定光源を動かすことなく偏光状態を保つとともに、光の損失や収差を抑えることができる光断層撮像装置を提供する。【解決手段】 走査部を介して測定光が照射された被検査物からの戻り光と、該測定光に対応する参照光とを合波した光に基づいて、該被検査物の断層画像を取得する光断層撮像装置であって、光源から照射された光を測定光と参照光とに分割する分割部と、前記測定光の光路における分割部と走査部との間に配置された合焦部と、を有し、測定光を被検眼に照射する際には測定光が透過する光路分岐手段を光路から離脱させる。【選択図】 図1
