An imaging apparatus with improved detection accuracy of the state of a subject is provided. An imaging apparatus comprises: an imaging optical system configured to form an optical image of a face of a subject in a vehicle an image sensor configured to capture the formed optical image and generate a captured image and an image processor configured to determine a state of the subject based on the captured image, wherein the imaging apparatus satisfies F≥0.0003f2/p, where F is an F value of the imaging optical system, f is a focal length of the imaging optical system, and p is a pixel pitch of the image sensor.
