PROBLEM TO BE SOLVED: To provide an endoscope apparatus which can be downsized and reduced in diameter without needing an imaging optical system and an image sensor and which performs imaging and spectrum analysis. SOLUTION: An optical fiber 1 which guides light supplied from a light source 209, which is emitted as diffused light 10 and receives reflected light which returns from a subject 3, and a wavefront 5 of the diffused light 10 by an imaging principle of optical coherence tomography. Optical interference resolution processing unit 207 that performs resolution processing in the traveling direction of the light, scanning mechanism 8 that scans diffused light 10 in scanning direction Y that intersects central axis X of diffused light 10, and optical interference resolution processing unit 207. The storage unit 211 that stores the data string 177 generated by the resolution processing by the, and the data AD-1 to AD-n that match the optical path length OPL from the one end 51 of the optical fiber 1 to the position of the pixel 173 to be detected are stored. An endoscope apparatus including: a synthetic aperture processing unit 213 that extracts and adds from a data sequence 177 stored in the unit 211. [Selection diagram] Figure 1【課題】結像光学系、イメージセンサーが不要で小型化・細径化ができ、撮像やスペクトル解析を行う内視鏡装置を提供すること。【解決手段】光源２０９から供給される光を導光し、拡散光１０として出射し、被写体３から戻る反射光を受光する光ファイバー１と、光干渉断層法の撮像原理によって拡散光１０の波面５の進行方向の解像処理を行う光干渉解像処理部２０７と、拡散光１０の中心軸Ｘと交差する走査方向Ｙに拡散光１０を走査する走査機構８と、光干渉解像処理部２０７による解像処理により生成されるデータ列１７７を記憶する記憶部２１１と、光ファイバー１の一端５１から検出する画素１７３の位置までの光路長ＯＰＬと一致するデータＡＤ‐１～ＡＤ‐ｎを、記憶部２１１に記憶されているデータ列１７７から抽出し、加算する合成開口処理部２１３と、を備える内視鏡装置。【選択図】図１
