  By using the non-supersymmetric $p$-brane solutions delocalized in arbitrary
number of transverse directions in type II supergravities, we show how they can
be regarded as interpolating solutions between unstable D$p$-branes (a non-BPS
D-brane or a pair of coincident D-brane-antiD-brane) and fundamental strings
and also between unstable D$p$-branes and NS5-branes. We also show that some of
these solutions can be regarded as interpolating solutions between
NS5/$\bar{\rm NS}$5 and D$p$-branes (for $p \leq 5$). This gives a closed
string description of the tachyon condensation and lends support to the
conjecture that the open string theory on unstable D-branes at the tachyonic
vacuum has soliton solutions describing not only the lower dimensional BPS
D-branes, but also the fundamental strings as well as the NS5-branes.
