Disclosed is an optical coherence tomography device, capable of: accurately adjusting a motion distance between an eyeball to be measured and the optical coherence tomography device； and aligning the center. The optical coherence tomography device comprises: a Mire ring optical system to irradiate Mire ring measuring light to an object to be measured； an image photographing unit to detect an illumination light image reflected from the object to be measured and a Mire ring light image reflected from the object to be measured； a single layer image photographing unit to irradiate signal light to the object to be measured to photograph an internal single image of the object to be measured； a color selecting mirror to separate a route of the illumination light reflected from the object to be measured of the image photographing unit from a route of the signal light of the single layer image photographing unit, transmit a reflection image of the illumination light to an image photographing unit, and transmit the reflected signal light to the single layer image photographing unit； an objective lens to focus the signal light and the illumination light which enter the object to be measured or are reflected from the object to be measured； and a control unit to calculate horizontal and vertical movement quantities of the optical coherence tomography device from a difference between a location of the Mire ring light image and a location of an optical axis of the optical coherence tomography device and move the optical coherence tomography device in the horizontal and vertical directions to match the location of the Mire ring light image and the optical axis of the optical coherence tomography device.측정 대상인 안구와 광 간섭 단층촬영 장치 사이의 동작 거리 조절 및 중심 정렬을 정확히 수행할 수 있는 광 간섭 단층촬영 장치에가 개시된다. 상기 광 간섭 단층촬영 장치는, 측정 대상으로 마이어링 측정광을 조사하는 마이어링 광학계； 상기 측정 대상에서 반사된 조명광의 이미지 및 상기 측정 대상에서 반사된 마이어링 광 이미지를 검출하는 이미지 촬영부； 상기 측정 대상으로 신호광을 조사하여, 측정 대상의 내부 단층 이미지를 촬영하는 단층 영상 촬영부； 상기 측정 대상으로부터 반사된 상기 이미지 촬영부의 조
