PROBLEM TO BE SOLVED: To reduce an imaging time (a time until imaging completion including each adjustment or the like) when acquiring a high-resolution tomographic image by OCT (Optical Coherence Tomography).SOLUTION: An imaging apparatus includes: an optical path length adjustment means adjusting a difference between an optical path length of measurement light and an optical path length of reference light based on first return light corresponding to the measurement light having a first light flux diameter and a wave-combined light detection means detecting light formed by wave-combining the reference light and second return light corresponding to the measurement light having a second light flux diameter larger than the first light flux diameter after the optical path length adjustment means adjusts the difference.COPYRIGHT: (C)2013,JPO&INPIT【課題】 高解像度の断層画像をOCTにより取得するに際し、撮像時間(各調整等を含む撮像完了までの時間)の短縮化を図ること【解決手段】 被検査物の断層画像を取得する撮像装置は、第1の光束径の測定光に対応する第1の戻り光に基づいて、測定光の光路長と参照光との光路長との差を調整する光路長調整手段と、該光路長調整手段が該差を調整した後に、該第1の光束径より大きい第2の光束径の測定光に対応する第2の戻り光と参照光とを合波した光を検出する合波光検出手段と、を有する。【選択図】 図7
