Despite the ATLAS experiment at the LHC is a general purpose experiment,
its performance allows to provide, in some areas, competitive results in
the field of B-hadron physics compared to dedicated B-physics experiments
like LHCb. An overview of the B-physics results obtained with the ATLAS experiment will be presented, with focus on CP-violation measurement in Bs->J/psiphi channel and search for beyond-SM phenomena in rare B-decays.
