  Possibility of electroweak baryogenesis (EWBG) via multi-step phase
transition (PT) is considered. We investigate the EWBG between $SU(2)$ broken
phases in the second step PT of the two-step PT. The produced baryon number
asymmetry is evaluated using a prototypical model with a $SU(2)$ charged CP-odd
scalar field. We show that the second step PTs where the sphaleron rate is
possible to be un-suppressed before the PTs, which can reproduce the sufficient
baryon number asymmetry. Our studies can be adapted to models with extra
$SU(2)$ scalar fields. We discuss specific models suitable for our scenario.
