1 (fair copy)1. An optical tomographic image photographing apparatus comprising: - an interference optical system arranged to detect spectral informationon 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 disposed in an optical path of one of the reference light and the measurement light and moveable in an optical axis direction on the interference optical system; - a driving unit arranged to change an optical path length by moving the optical member in the optical axis direction; - a monitor; - a control unit arranged to control driving of the driving unit, and to obtain tomographic images of a portion of the eye by performing Fourier analysis on the detected spectral information, and display a tomographic image on a screen of the monitor; and - an image setting unit arranged to previously set the tomographic image to be displayed on the screen of the monitor to be one of a normal image and an inverted image of two tomographic images of the portion of the eye symmetric with respect to a depth position, wherein the control unit is arranged: - to control the driving of the driving unit so as to move the optical member from an initial position in a predetermined direction in given steps to moving positions, and - to determine whether or not a tomographic image that is obtained at each moving position is the tomographic image of the portion of the eye, and: - when it is determined that the tomographic image is not the tomographic image of the portion of the eye, to move the optical member to the next moving position, and - when it is determined that the tomographic image is the tomographic image of the portion of the eye, to determine whether the tomographic image of the portion of the eye is only the normal image, only the inverted image, or both of the normal image and the inverted image based on at least one of luminance distribution in the tomographic image of the portion of the eye and a shape of a given portion of the portion of the eye in the tomographic image of the portion of the eye, and wherein the control unit is arranged: - to determine whether or not the tomographic image subjected to the determinations is only the image previously set by the image setting unit, and - when it is determined that the tomographic image is not only the previously set image, to move the optical member to a position such that only the previously set image is obtained, - and when it is determined that the tomographic image is the previously set image, to further move the optical member to a position such that the imageposition of the tomographic image in the depth direction coincides with a predetermined adjustment position such that the image of the portion of the eye is displayed at a desired position on the monitor. - an interference optical system arranged to detect spectral informationon 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 disposed in an optical path of one of the reference light and the measurement light and moveable in an optical axis direction on the interference optical system; - a driving unit arranged to change an optical path length by moving the optical member in the optical axis direction; - a monitor; - a control unit arranged to control driving of the driving unit, and to obtain tomographic images of a portion of the eye by performing Fourier analysis on the detected spectral information, and display a tomographic image on a screen of the monitor; and - an image setting unit arranged to previously set the tomographic image to be displayed on the screen of the monitor to be one of a normal image and an inverted image of two tomographic images of the portion of the eye symmetric with respect to a depth position, - to control the driving of the driving unit so as to move the optical member from an initial position in a predetermined direction in given steps to moving positions, and - to determine whether or not a tomographic image that is obtained at each moving position is the tomographic image of the portion of the eye, and: - when it is determined that the tomographic image is not the tomographic image of the portion of the eye, to move the optical member to the next moving position, and - when it is determined that the tomographic image is the tomographic image of the portion of the eye, to determine whether the tomographic image of the portion of the eye is only the normal image, only the inverted image, or both of the normal image and the inverted image based on at least one of luminance distribution in the tomographic image of the portion of the eye and a shape of a given portion of the portion of the eye in the tomographic image of the portion of the eye, and - to determine whether or not the tomographic image subjected to the determinations is only the image previously set by the image setting unit, and - when it is determined that the tomographic image is not only the previously set image, to move the optical member to a position such that only the previously set image is obtained, - and when it is determined that the tomographic image is the previously set image, to further move the optical member to a position such that the imageposition of the tomographic image in the depth direction coincides with a predetermined adjustment position such that the image of the portion of the eye is displayed at a desired position on the monitor.