PROBLEM TO BE SOLVED: To make a tomographic image of a subject to be displayed continuously clear from the center to the edges of the image even when an imaging view angle wider than before is used.SOLUTION: The present invention relates to an optical tomographic imaging apparatus which captures a tomographic image of a subject based on interference light obtained by return light from the subject illuminated with measuring light via scanning means and reference light corresponding to the measuring light, the optical tomographic imaging apparatus comprising: switching means for toggling between a mode of the reference light bypassing a light path length changing material and a mode of the reference light passing through the light path length changing material to switch the light path length of the reference light and image generation means for generating a new tomographic image based on a tomographic image captured in the mode of the reference light bypassing the light path length changing material in a first range and a tomographic image captured in the mode of the reference light passing through the light path length changing material in a second range different from the first range.SELECTED DRAWING: Figure 4COPYRIGHT: (C)2017,JPO&INPIT【課題】撮影画角が従来よりも広い範囲を採用した場合でも、断層画像の中央から周辺まで連続した明瞭な被検査物の断層画像を表示させる。【解決手段】走査手段を介して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から得られる干渉光に基づいて、被検査物の断層画像を撮る光断層撮像装置において、参照光の光路長を切り換えるために、参照光が光路長変更部材を経ない状態と光路長変更部材を経る状態とを切り替える切替手段と、参照光が光路長変更部材を経ない状態で得た被検査物の第一の範囲の断層画像と、参照光が光路長変更部材を経る状態で得た被検査物の第一の範囲とは異なる第二の範囲の断層画像とに基づいて、新たな断層画像を生成する画像生成手段と、を配する。【選択図】図4
