  The masses of the flavor octet and singlet baryons with negative parity and
spin 1/2 are calculated using the QCD sum rule. We find that the chiral
symmetry breaking vacuum condensates cause the mass splitting of the positive
and negative baryons. The present sum rule reproduces the observed masses of
these baryons within 10%, and predicts the mass of the excited Xi baryon with
$J^P = {1/2}^{-}$ at 1.63 GeV. We confirm that the negative-parity state,
$\Lambda_S-$, is the ground state in the flavor singlet baryon spectrum.
