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 preventing deterioration of wavelength separation performance in a dichroic mirror.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. Primary image forming magnification of an optical system of the optical path of the measurement light or an observation optical path, and a numerical aperture of the light source emitting the measurement light are configured such that a maximum inclination of light rays included in a light flux of the measurement light to an optical axis of the optical path becomes 2° or less.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、ダイクロイックミラーにおける波長分離性能の低下を防ぐ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、前記測定光の光束に含まれる光線の前記光路の光軸に対する最大傾角が2°以下になるように、前記測定光の光路または前記観察光路の光学系の一次結像倍率および前記測定光を照射する光源の開口数が構成される。【選択図】 図1
