An optical tomographic image photographing apparatus comprising: - an interference optical system arranged to detect spectral information on interference light of measurement light projected onto an examinee's eye and reference light, and comprising an optical scanner arranged to scan the measurement light which is emitted from a light source; and an optical member (31, 24, 39b) disposed in an optical path of one of the reference light and the measurement light and movable in an optical axis direction of the interference optical system wherein the interference optical system comprises an optical coherence tomography optical system; - a driving unit (50, 24a) arranged to change an optical path length by moving the optical member in the optical axis direction; - a monitor; and - a control unit arranged to control driving of the driving unit, and to obtain two symmetrical tomographic images of a subject portion of the eye, symmetric to a depth position, by performing Fourier analysis on the detected spectral information, extract one of the two obtained tomographic images, and display the extracted tomographic image on a screen of the monitor, characterized in that - the control unit is arranged to - when obtaining and extracting the normal image as one of the two tomographic images, control the driving of the driving unit to move the optical member so as to position a front surface of the subject portion on the rear side of said depth position, and obtain and extract the normal image of the subject portion, - when obtaining and extracting the inverted image as the other of the two tomographic images, control the driving of the driving unit to move the optical member so as to position the front surface of the subject portion on the front side of the depth position, and obtain and extract the inverted image of the subject portion, and - perform image combining processing on both of the normal image and the inverted image to obtain a synthetic tomographic image of the subject portion of the eye, and display the synthetic tomographic image of the subject portion of the eye on the screen of the monitor. - an interference optical system arranged to detect spectral information on interference light of measurement light projected onto an examinee's eye and reference light, and comprising an optical scanner arranged to scan the measurement light which is emitted from a light source; and an optical member (31, 24, 39b) disposed in an optical path of one of the reference light and the measurement light and movable in an optical axis direction of the interference optical system wherein the interference optical system comprises an optical coherence tomography optical system; - a driving unit (50, 24a) arranged to change an optical path length by moving the optical member in the optical axis direction; - a monitor; and - a control unit arranged to control driving of the driving unit, and to obtain two symmetrical tomographic images of a subject portion of the eye, symmetric to a depth position, by performing Fourier analysis on the detected spectral information, extract one of the two obtained tomographic images, and display the extracted tomographic image on a screen of the monitor, characterized in that - the control unit is arranged to - when obtaining and extracting the normal image as one of the two tomographic images, control the driving of the driving unit to move the optical member so as to position a front surface of the subject portion on the rear side of said depth position, and obtain and extract the normal image of the subject portion, - when obtaining and extracting the inverted image as the other of the two tomographic images, control the driving of the driving unit to move the optical member so as to position the front surface of the subject portion on the front side of the depth position, and obtain and extract the inverted image of the subject portion, and - perform image combining processing on both of the normal image and the inverted image to obtain a synthetic tomographic image of the subject portion of the eye, and display the synthetic tomographic image of the subject portion of the eye on the screen of the monitor.