The invention relates to a viewing optical
system for viewing an object image formed on a focusing screen, and an imaging apparatus comprising the same. An image erection optical
system comprises a
prism having an internal reflective surface. An
eyepiece optical
system comprises, in order from a screen side to an
exit pupil side, a first lens component having negative refracting power wherein its
exit pupil-side surface has a paraxial-
radius-of-curvature absolute value smaller than that of its screen-side surface, a second lens component in a double-convex shape and a third
meniscus lens component in a
meniscus shape concave on an
exit pupil side. The total number of lens components included in the
eyepiece optical system is 3, and the following conditions (1), (2) and (3) are satisfied.1.55<ndp (1)0.35<fe / Dip<0.60 (2)1.0<D3 / (D1+D2)<1.8 (3)