  We study CP violating B decays in the minimal supersymmetric standard model
with R-parity violation. We estimate how much R-parity violation modifies the
SM predictions for CP asymmetries in B decays within the present bounds. The
effects of R-parity- and lepton-number-violating couplings on the ratio of the
decay amplitude due to R-parity violation to that of the SM can differ by one
or two orders of magnitudes depending on the models of the left-handed quark
mixing. It is possible to disentangle the R-parity violating effects from those
of the SM and R-parity- conserving supersymmetric models within the present
bounds comparing different CP violating decay amplitudes. We also study the
effects of R-parity- and baryon-number-violating couplings and find that the
effects could be large.
