Provided is an optical tomography apparatus acquiring high-quality tomographic images even if light source characteristic is different between sweeps in first and second directions, when acquiring the image by reciprocating sweep. The optical tomography apparatus includes: a wavelength swept light source device a splitting-combining unit splitting light from the device into measurement and reference light, and combining return light from an object to be measured by the measurement light and the reference light and an image processing unit acquiring a tomographic image of the object based on combined light. The device includes a reciprocating sweep light source device performing a first wavelength sweep from short to long wavelength and a second wavelength sweep from long to short wavelength. The processing unit acquires first and second tomographic images based on signals acquired by these wavelength sweeps for the same site, and combines the tomographic images to acquire the tomographic image.
