  The recently observed narrow resonance $Z_{b}(10610)$ is examined with the
assumptions both as a $B^{*}\bar{B}$ molecular state and a
$[bd][\bar{b}\bar{u}]$ tetraquark state with quantum numbers
$I^{G}J^{P}=1^{+}1^{+}$. Possible interpolating currents are constructed to
describe the $Z_{b}(10650)$ as an axial-vector $B^{*}\bar{B}^{*}$ molecular
state or a $[bd][\bar{b}\bar{u}]$ tetraquark state. Using QCD sum rules
(QCDSR), we consider contributions up to dimension six in the operator product
expansion (OPE) at the leading order in $\alpha_{s}$. The mass is obtained as
$(10.44\pm0.23) GeV$ for molecular state and $(10.50\pm0.19) GeV$ for
tetraquark state, both of which coincide with the $Z_{b}(10610)$. The results
$m_{B^{*}\bar{B}^{*}}=(10.45\pm0.31) GeV$ and
$m_{[bd][\bar{b}\bar{u}]}=(10.48\pm0.33) GeV$ are consistent with the
$Z_{b}(10650)$.
