  In the supersymmetric standard model which is not minimal, the Higgs
potential does not conserve CP symmetry generally. Assuming that there exists
an SU(2)-triplet Higgs field, we discuss resultant CP-violating effects on the
Higgs bosons. The experimentally observed Higgs boson, which should be CP-even
in the standard model, could decay into two photons of CP-odd polarization
state non-negligibly. For the second lightest Higgs boson, in sizable region of
parameter space, the dominant decay modes are different from those expected by
the standard model. The two-photon decay could yield both even and odd CP final
states at a ratio of oder of unity.
