  Recently it was shown that discrete R-invariance in superpotential can lead
to a successful flat potential in inflation. We suggest that this discrete
R-symmetry arises from an underlying supersymmetric gauge theory, which gives
rise to a scalar inflaton as a composite field.
  This discrete R-symmetry is common to the dynamical breaking scenarios in
global supersymmetry studied several years ago.
  Some extension of the R-invariance method is also shown.
