An imaging apparatus comprising: a light source configured to emit light while sweeping a wavelength of the light; an interference unit configured to split the light emitted from the light source into illumination light that is incident on a fundus and reference light and to generate interference light obtained by reflection light reflected from the fundus on which the illumination light is incident interfering with the reference light; a scan unit configured to scan the illumination light across the fundus; a detector configured to detect the interference light generated by the interference unit ; a converter configured to convert an analog signal generated from the interference light detected by the detector into a digital signal; a clock generator configured as an interferometer including an optical path through which part of the light emitted from the light source passes, the optical path being split into a first optical path and a second optical path having an optical path length difference relative to the first optical path, to generate a clock used by the converter sampling the analog signal; and a tomographic image obtaining unit configured to obtain a tomographic image of the fundus by using the digital signal converted from the analog signal sampled by the converter in accordance with the generated clock, characterised in that the scan unit is configured to scan the illumination light across the fundus over a scan angle equal to or larger than 47 degrees in air, the tomographic image obtaining unit is configured to obtain a tomographic image of the fundus at a distance equal to or larger than 4.0 mm within an eyeball in a depth range, and the clock generator is configured so that the optical path length difference is equal to or larger than 22/n mm in air in a case where the generated clock has a frequency n times a frequency of the interferometer corresponding to the optical path length difference, n being an integer equal to or larger than 1. a light source configured to emit light while sweeping a wavelength of the light; an interference unit configured to split the light emitted from the light source into illumination light that is incident on a fundus and reference light and to generate interference light obtained by reflection light reflected from the fundus on which the illumination light is incident interfering with the reference light; a scan unit configured to scan the illumination light across the fundus; a detector configured to detect the interference light generated by the interference unit ; a converter configured to convert an analog signal generated from the interference light detected by the detector into a digital signal; a clock generator configured as an interferometer including an optical path through which part of the light emitted from the light source passes, the optical path being split into a first optical path and a second optical path having an optical path length difference relative to the first optical path, to generate a clock used by the converter sampling the analog signal; and a tomographic image obtaining unit configured to obtain a tomographic image of the fundus by using the digital signal converted from the analog signal sampled by the converter in accordance with the generated clock, characterised in that the scan unit is configured to scan the illumination light across the fundus over a scan angle equal to or larger than 47 degrees in air, the tomographic image obtaining unit is configured to obtain a tomographic image of the fundus at a distance equal to or larger than 4.0 mm within an eyeball in a depth range, and the clock generator is configured so that the optical path length difference is equal to or larger than 22/n mm in air in a case where the generated clock has a frequency n times a frequency of the interferometer corresponding to the optical path length difference, n being an integer equal to or larger than 1. <EOS>