PROBLEM TO BE SOLVED: To provide an OCT device that prevents an influence due to return light to a light source occurring when generating an A-scan trigger with respect to a tomographic image without requiring an addition of components leading to increase in cost.SOLUTION: An optical coherence tomography imaging device comprises: a wavelength sweep light source that sweeps a wavelength of light to be emitted； a coherence unit that uses the light emitted from the wavelength sweep light source and within a wavelength range from a third wavelength to a fourth wavelength to make light from an inspection optical path and reference optical path interfere； an information acquisition unit that acquires information on a subject from a coherence signal created on the basis of interfered light； a wavelength filter that reflects light having a fifth wavelength； and a detection unit that detects reflection light from the wavelength filter, and creates a trigger signal. The information acquisition unit is configured to acquire the information on the subject from the coherence signal on the basis of the trigger signal. A time when light of the fourth and fifth wavelengths are emitted sets to be T4 to T5, a speed of light sets to be c, and an optical path length of an optical path connecting the wavelength sweep light source to the wavelength filter sets to be D, the optical path length D satisfies a relation of T4-T5<；2D/c.SELECTED DRAWING: Figure 1【課題】コストアップに繋がる部品の追加を要することなく、断層画像に対するＡ－ｓｃａｎトリガ生成時に生じる光源への戻り光による影響を防ぐ、ＯＣＴ装置を提供する。【解決手段】出射する光の波長を掃引する波長掃引光源と、波長掃引光源から出射された、第３の波長から第４の波長までの波長範囲の光を用いて、検査光路及び参照光路からの光を干渉させる干渉部と、干渉させた光に基づいて生成される干渉信号から被検体の情報を取得する情報取得部と、第５の波長を有する光を反射する波長フィルタと、波長フィルタからの反射光を検出し、トリガ信号を生成する検出部とを備え、情報取得部は、トリガ信号に基づいて、干渉信号から被検体の情報を取得し、第４～５の波長の光が出射される時間をＴ４～Ｔ５とし、光速をｃとし、波長掃引光源と波長フィルタを結ぶ光路の光路長Ｄとしたとき、光路長ＤがＴ４－Ｔ５＜２Ｄ／ｃの関係を満たす、光干渉断層撮像装置。【選択図】図１
