An illuminating apparatus having a light source, an optical unit disposed
on the object side of the light source having a lens portion having
positive refractive power in the central portion thereof, incidence
surfaces on which light from the light source is incident and reflecting
surfaces for totally reflecting the incident light, on both sides of the
lens portion, and an emergence surface from which the light reflected by
the reflecting surfaces emerges, wherein a beam emerging from the lens
portion and a beam emerging from the emergence surface intersect with each
other substantially at the same place in their condensed state, and a
second optical unit having a plurality of prism portions, wherein the
relative interval between the optical unit and the second optical unit are
changed to vary an irradiation angle.
