An optical tomographic device configured to acquire a tomographic image of a subject, the optical tomographic device comprising: a light source; a measurement light generator (21 to 29, 31, 32) adapted to generate measurement light by using light from the light source, which is irradiated onto the subject and reflected by the subject; a reference light generator (41 to 46, 51) adapted to generate reference light by using the light from the light source; an interfering light generator (60, 70) adapted to generate interfering light by combining the reflected light reflected from the subject and the reference light generated in the reference light generator (41 to 46, 51); and an interfering light detector (80, 90) adapted to detect the interfering light generated in the interfering light generator (60, 70) and to convert the interfering light into interfering signals; wherein the measurement light generator (21 to 29, 31, 32) is adapted to generate at least two measurement lights with different optical path lengths, to superimpose the at least two measurement lights, to irradiate the superimposed at least two measurement lights onto the subject the reference light generator (41 to 46, 51) is adapted to generate at least two reference lights with different optical path lengths, characterised in that the measurement light generator (21 to 29, 31, 32) is adapted to split the reflected light reflected from the subject into at least two reflected lights, and to guide the split at least two reflected lights to the interfering generator,; and in that the interfering light generator (60, 70) includes at least two interfering light generators, each interfering light generator (60, 70) is configured to combine one of the at least two reflecting lights with different optical path lengths guided from the measurement light generator (21 to 29, 31, 32) and the corresponding one of the at least two reference lights with different optical path lengths generated in the reference light generator (41 to 46, 51), the interfering light detector (80, 90) includes at least two interfering light detectors, each interfering light detector (80, 90) is configured to detect the interfering light generated in the corresponding one of the at least two interfering light generators (60, 70) and convert the detected interfering light into the corresponding one of the at least two interfering signals. a light source; a measurement light generator (21 to 29, 31, 32) adapted to generate measurement light by using light from the light source, which is irradiated onto the subject and reflected by the subject; a reference light generator (41 to 46, 51) adapted to generate reference light by using the light from the light source; an interfering light generator (60, 70) adapted to generate interfering light by combining the reflected light reflected from the subject and the reference light generated in the reference light generator (41 to 46, 51); and an interfering light detector (80, 90) adapted to detect the interfering light generated in the interfering light generator (60, 70) and to convert the interfering light into interfering signals; wherein the measurement light generator (21 to 29, 31, 32) is adapted to generate at least two measurement lights with different optical path lengths, to superimpose the at least two measurement lights, to irradiate the superimposed at least two measurement lights onto the subject the reference light generator (41 to 46, 51) is adapted to generate at least two reference lights with different optical path lengths, characterised in that the measurement light generator (21 to 29, 31, 32) is adapted to split the reflected light reflected from the subject into at least two reflected lights, and to guide the split at least two reflected lights to the interfering generator,; and in that the interfering light generator (60, 70) includes at least two interfering light generators, each interfering light generator (60, 70) is configured to combine one of the at least two reflecting lights with different optical path lengths guided from the measurement light generator (21 to 29, 31, 32) and the corresponding one of the at least two reference lights with different optical path lengths generated in the reference light generator (41 to 46, 51), the interfering light detector (80, 90) includes at least two interfering light detectors, each interfering light detector (80, 90) is configured to detect the interfering light generated in the corresponding one of the at least two interfering light generators (60, 70) and convert the detected interfering light into the corresponding one of the at least two interfering signals.