  We study the possibility of spontaneous CP violation in the next-to-minimal
supersymmetric standard model (NMSSM). It is shown that the spontaneous CP
violation is induced by the radiative effects of top, stop, bottom and sbottom
superfields. The available regions of parameters, which are obtained by
imposing the constraints from experiments, are rather narrow. We also obtain
strong constraints for light Higgs masses such as m_H \le 36 GeV numerically.
Sum of masses of two light neutral Higgs should set around 93 GeV and charged
Higgs boson has a rather higher mass larger than 700 GeV.
