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We report a preliminary measurement of the branching fraction
for the decay $B^0 \rightarrow K^0_sK^0_sK^0_s ,$
where the $K^0_s$ mesons are reconstructed through the decay
$K^0_s\rightarrow\pi^+ \pi^- .$
The measurement was performed on a sample of $211\times 10^6$
$B\overline{B}$ pairs collected by the BABAR detector
running on the $\Upsilon (4S)$ resonance at the PEP-II storage ring.
The branching fraction is measured to be
$${\cal B}(B^0 \rightarrow K^0_sK^0_sK^0_s )=
(6.5\pm 0.8\pm 0.8 ) \times 10^{-6},$$
where the errors are statistical and systematic, respectively.
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