  We reconstruct boundary superstring field theory via boundary states. After a
minor modification of the fermionic two-form, all the equations needed for
Batalin-Vilkovisky formulation are simply represented by closed string
oscillators and the proof of gauge invariance is drastically simplified. The
general form of the action of boundary superstring field theory is also
obtained without any assumption and found to take exactly the same form as the
bosonic one. As a special case of this action, we revisit the conjecture that
the action is simply given by the disk partition function when matter and
ghosts are completely decoupled.
