An optical coherence tomography observation apparatus comprising a controller (30) and a detector (40), the controller being configured to illuminate first illumination light to an observation object, cause an image generator to generate a first tomographic image showing tomography of the observation object, illuminate second illumination light to the observation object, and cause the image generator to generate a second tomographic image showing tomography of the observation, and the detector being configured to detect a relative position of the second tomographic image with respect to the first tomographic image, at which a correlation of the second tomographic image with the first tomographic image becomes highest, are provided.