  The electroweak phase transition in the Two-Higgs-Doublet Model is
investigated. The Gibbs potential at finite temperature is computed with regard
for the one-loop plus ring diagram contributions. The strong first-order phase
transition satisfying Sakharov's baryogenesis conditions is determined for the
values of scalar field masses allowed by experimental data. The relation
between the model parameters supplying the phase transition to be of the first
order is derived. It is shown that a sequence of phase transitions is also
possible. A comparison with results of other authors is done.
