Provided are an optical interference tomographic image generating apparatus and a method for using the same, whereby an image can be acquired in which the effect of unnecessary matter near a sample is reduced. An optical interference tomographic image generating apparatus is provided with an OCT control device for performing image processing for vertically inverting an image generated from a detection signal in the case of a setting whereby a reference mirror is disposed so that the optical path length of a reference optical path matches the optical path length of a sample optical path having as a reference position a position at a greater depth along the optical axis of a sample than a subject.