  We measure the branching fraction and $CP$ violation asymmetry in the decay
$B^{0}\to \pi^{0}\pi^{0}$, using a data sample of $752\times 10^{6}$ $B\bar{B}$
pairs collected at the $\Upsilon(4S)$ resonance with the Belle detector at the
KEKB $e^{+}e^{-}$ collider. The obtained branching fraction and direct $CP$
asymmetry are $ \mathcal{B}(B\to \pi^{0}\pi^{0}) = [1.31 \pm 0.19~
\text{(stat.)} \pm 0.19~ \text{(syst.)}] \times 10^{-6}$ and $
  A_{CP} = +0.14 \pm 0.36~ \text{(stat.)} \pm 0.10~ \text{(syst.)}, $
respectively. The signal significance, including the systematic uncertainty, is
6.4 standard deviations. We combine these results with Belle's earlier
measurements of $B^{0}\to \pi^{+} \pi^{-}$ and $B^{\pm} \to \pi^{\pm} \pi^{0}$
to exclude the $CP$-violating parameter $\phi_{2}$ from the range $15.5^{\circ}
< \phi_{2} < 75.0^{\circ}$ at 95\% confidence level.
