  The Ginsparg-Wilson(G-W) relation for chiral symmetry is extended for a
supersymmetrical(SUSY) case on a lattice.
  It is possible to define exact lattice supersymmetry which are devided into
two different cases according to using difference operators.
  $U(1)_R$ symmetry on the lattice is also realized as one of exact symmetries.
For an application, the extended G-W relation is given for a two-dimensional
model with chiral multiplets.
