A dental measurement Fourier domain optical coherence tomograph comprises a light source (16), a light splitting section (19) for splitting the light emitted from the light source (16) into a reference light (29) directed to a reference mirror (24) and a measurement light (28) directed to a measurement object sample (22), an interference section (19) for causing interference between the measurement light (28) and the reference light (29) to generate an interference light , a diffraction element (25) for dispersing the interference light, an optical sensor (26) for measuring the spectrum produced by the dispersion by the diffraction element (25), and a computing section (27) for performing inverse Fourier transform of the spectrum and thereby collecting information on the measurement light of the measurement object sample in the light application direction. The measurement object sample (22) is a stomatognathic region of an organism or an artificial composition in the stomatognathic region. With this, an optical coherence tomograph adaptable to dental measurement can be provided.
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