An imaging device includes a first imaging optical system; a first imaging unit that converts an optical image of a subject formed via the first imaging optical system into an electrical signal and produces an image signal of a first imaged image; a second imaging optical system; a second imaging unit that converts an optical image of the subject formed via a second imaging optical system into an electrical signal and produces an image signal of a second imaged image; and a control unit that independently control the first imaging optical system and the second imaging optical system and performs individually a focus adjustment of the first imaged image and the second imaged image.