1. An ophthalmic imaging apparatus comprising: an optical coherence tomography (OCT) optical system configured to acquire a tomographic image of a subject eye by using interference between a measurement light which is emitted to the subject eye and a reference light; an observation optical system configured to acquire a front image of the subject eye; a processor; and a memory storing computer readable instructions, when executed by the processor, causing the ophthalmic imaging apparatus to function as: an image generation unit configured to repeatedly generate the tomographic image based on an output signal from the OCT optical system, and repeatedly generate the front image based on an output signal from the observation optical system; a determination unit configured to detect a positional deviation between a front image set as a reference front image and each of front images generated by the image generation unit, and to determine consecutiveness of the front images whose positional deviation satisfies a permissible range; and a selection process unit configured to perform selection process to select one of multiple tomographic images generated by the image generation unit, based on a determination result by the determination unit.