  We investigate the electroweak phase transition in the presence of a large CP
violation in the squark sector of the MSSM. When the CP violation is large,
scalar-pseudoscalar mixing of the Higgs bosons occurs and a large CP violation
in the Higgs sector is induced. It, however, weakens first-order phase
transition before the mixing reaches the maximal. Even when the CP violation in
the squark sector is not so large that the phase transition is strongly first
order, the phase difference between the broken and symmetric phase regions
grows to O(1), which leads to successful baryogenesis, when the charged Higgs
bosons is light.
