Provided is an image generating apparatus including: an acquisition unit configured to acquire tomographic data on an object to be inspected, the tomographic data being obtained by performing optical coherence tomography imaging of the object to be inspected through use of measurement light； an eccentric amount acquisition unit configured to acquire an eccentric amount of an optical axis of the measurement light with respect to the object to be inspected； and a generation unit configured to generate a tomographic image through use of the acquired tomographic data. The generation unit includes: a calculation unit configured to calculate, through use of the eccentric amount, an incident angle variation of the measurement light entering the object to be inspected, and an optical path length variation of the measurement light； and a correction unit configured to correct the tomographic data through use of the incident angle variation and the optical path length variation.
