An optical apparatus for acquiring structure information which splits a wavelength-swept light outputted from a wavelength-swept light source (12) into a sampling light and a reference light, scans a subject having a layer structure with the sampling light, and acquires optical structure information of the subject based on an interference signal between a return light which is reflected or backscattered at the subject and the reference light which has propagated a predetermined optical path length, the optical apparatus for acquiring structure information comprises: a layer information extraction device (20) which extracts layer information of the subject based on the interference signal a feature value calculation device (20) which calculates a feature value of the layer information and an enhanced layer-structure image construction device (20) which constructs an enhanced layer-structure image in which the layer structure is enhanced based on the feature value.
