A surgery support device comprising: - a profile measurement means for optically measuring an irradiated subject across the whole exposed surface of the irradiated subject and for obtaining surface profile information representing a three-dimensional position of each location on the exposed subject surface; - input means for inputting a plurality of high resolution tomographic images of the subject captured prior to surgery; - correspondence processing means for acquiring the surface profile information obtained by the profile measurement means prior to surgery and for corresponding each location on the subject surface with a surface position in the high resolution tomographic images, based on the acquired surface profile information and based on the plurality of high resolution tomographic images input by the input means, acquisition means for optically measuring the surface of the subject and optically measuring a profile of an exposed portion of a surgical instrument having a specific profile used for surgery by using the profile measurement means during surgery, and for acquiring instrument position information representing the three-dimensional position of an unexposed portion including the distal end portion of the surgical instrument, based on the measured position of the exposed portion, - combining means, for combining, based on the instrument position information acquired by the acquisition means, a surgical instrument image with the high resolution tomographic images such that the surgical instrument image showing the unexposed portion of the surgical instrument is aligned with each position of the unexposed portion including the distal end portion of the surgical instrument; and - a display controller for displaying the combined high resolution tomographic images combined by the combining means on a display, wherein the profile measurement means comprises a scanning device (54, 56, 58, 60, 62, 64, 66, 72) that scans light on the surface of the subject, and detection means (67, 68, 69, 70, 72) that detects the three-dimensional position of the location of irradiation of the light on the subject surface by receiving reflected light from the subject surface; and wherein the three-dimensional position detection by the detection means (67, 68, 69, 70, 72) is carried out repeatedly while scanning the light over each location on the subject surface. - a profile measurement means for optically measuring an irradiated subject across the whole exposed surface of the irradiated subject and for obtaining surface profile information representing a three-dimensional position of each location on the exposed subject surface; - input means for inputting a plurality of high resolution tomographic images of the subject captured prior to surgery; - correspondence processing means for acquiring the surface profile information obtained by the profile measurement means prior to surgery and for corresponding each location on the subject surface with a surface position in the high resolution tomographic images, based on the acquired surface profile information and based on the plurality of high resolution tomographic images input by the input means, acquisition means for optically measuring the surface of the subject and optically measuring a profile of an exposed portion of a surgical instrument having a specific profile used for surgery by using the profile measurement means during surgery, and for acquiring instrument position information representing the three-dimensional position of an unexposed portion including the distal end portion of the surgical instrument, based on the measured position of the exposed portion, - combining means, for combining, based on the instrument position information acquired by the acquisition means, a surgical instrument image with the high resolution tomographic images such that the surgical instrument image showing the unexposed portion of the surgical instrument is aligned with each position of the unexposed portion including the distal end portion of the surgical instrument; and - a display controller for displaying the combined high resolution tomographic images combined by the combining means on a display,