An in-finder indicator for a single-lens reflex camera comprises an
eyepiece lens, a reflecting mirror for reflecting a beam of light from a
subject, a screen having a screen surface which is subjected to surface
treatment to form prisms for presenting a superimposed indication and
which forms an image of the subject based on the light beam reflected by
the reflecting mirror, a dach mirror having a pair of mirror surfaces for
reflecting the light beam from the screen, a reflecting surface for
reflecting the light beam reflected by the dach mirror surfaces and
introducing the light beam to the eyepiece lens, and an illumination
member disposed in a laterally-offset space between the dach mirror
surfaces and the screen and introducing an illumination beam to enter the
screen surface laterally of the image formed on the screen surface.