An image display device includes: a first face; a laser light source
device emitting laser light; and a diffractive optical element on which
the laser light emitted from the laser light source device is incident,
generating diffracted light from the incident laser light, and
illuminating the first face with the diffracted light, the first face is
provided at a position on which zero-order light emitted from the
diffractive optical element is not incident, and an image is displayed by
light via the first face.