The imaging device includes an imaging device 40, an imaging optical system 10, a fixed mask 20, and a movable mask 30. The imaging optical system 10 forms an image of the subject 5 on the image sensor 40. The fixed mask 20 includes first to third apertures that divide the pupil of the imaging optical system 10, a first filter that passes the first wavelength band, and a second wavelength that is different from the first wavelength band. And a second filter FR that passes the band. The movable mask 30 has a light shielding part 34 and fourth to sixth openings provided in the light shielding part corresponding to the first to third openings, and is movable with respect to the imaging optical system 10. . The first filter is provided in the first opening. The second filter is provided in the second opening. The third opening is provided on the optical axis AXC of the imaging optical system 10.撮像装置は、撮像素子４０と結像光学系１０と固定マスク２０と可動マスク３０とを含む。結像光学系１０は、撮像素子４０に被写体５を結像させる。固定マスク２０は、結像光学系１０の瞳を分割する第１～第３の開口と、第１の波長帯域を通過させる第１のフィルタと、第１の波長帯域とは異なる第２の波長帯域を通過させる第２のフィルタＦＲとを有する。可動マスク３０は、遮光部３４と、第１～第３の開口に対応して遮光部に設けられた第４～第６の開口とを有し、結像光学系１０に対して可動である。そして、第１のフィルタは、第１の開口に設けられる。第２のフィルタは、第２の開口に設けられる。第３の開口は、結像光学系１０の光軸ＡＸＣ上に設けられる。
