A light source (60) is provided in the rear of display means (30), which
has a light transmission type display and is made up of pixels (31) for
left and right eyes and a first image separation mechanism (32) for the
left and right eyes, with a lens unit (41) having a collecting power in a
vertical direction and a second image separation mechanism (52)
therebetween. The transmission light from the light source (60) spreads in
the vertical direction as shown in the drawing. Such spread of the light
occurs over the whole of a display surface. It is therefore possible to
view the image on the display surface, when the viewer's head is located
at any of positions 1 to 4. Accordingly, it becomes possible to make a
degree of freedom in vertical (up-and-down) positional movement of the
viewer's head.
