An imaging apparatus comprising: an imaging optical system in which a first optical system , an optical filter composed of a first optical filter and a second optical filter , where the first optical filter is adapted to transmit light in a first wavelength band and the second optical filter is adapted to transmit light in a second wavelength band different from the first wavelength band, and a second optical system are arranged in order from the subject side; a directional sensor that has a plurality of pixels composed of two-dimensionally arranged photoelectric conversion elements, where the directional sensor is adapted to pupil-divide each of rays incident through the optical filter and to receive the rays selectively; and an image acquisition unit adapted to acquire, from the directional sensor , each of a first image received through the first optical filter and a second image received through the second optical filter , characterized in that the first optical filter and the second optical filter are arranged in different regions in a plane perpendicular to an optical axis (AX1) of the imaging optical system at a position of an entrance pupil of the imaging optical system , respectively, the first optical system is adapted to cause high image height rays imaged at a position at which an image height is high on an imaging surface of the directional sensor to be incident into the first optical filter and the second optical filter in a state where an upper ray and a lower ray of the high image height rays are parallel, and the first optical system constitutes an afocal optical system. an imaging optical system in which a first optical system , an optical filter composed of a first optical filter and a second optical filter , where the first optical filter is adapted to transmit light in a first wavelength band and the second optical filter is adapted to transmit light in a second wavelength band different from the first wavelength band, and a second optical system are arranged in order from the subject side; a directional sensor that has a plurality of pixels composed of two-dimensionally arranged photoelectric conversion elements, where the directional sensor is adapted to pupil-divide each of rays incident through the optical filter and to receive the rays selectively; and an image acquisition unit adapted to acquire, from the directional sensor , each of a first image received through the first optical filter and a second image received through the second optical filter , characterized in that the first optical filter and the second optical filter are arranged in different regions in a plane perpendicular to an optical axis (AX1) of the imaging optical system at a position of an entrance pupil of the imaging optical system , respectively, the first optical system is adapted to cause high image height rays imaged at a position at which an image height is high on an imaging surface of the directional sensor to be incident into the first optical filter and the second optical filter in a state where an upper ray and a lower ray of the high image height rays are parallel, and the first optical system constitutes an afocal optical system. <EOS>