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The electroweak penguin B decays mediated by $b \to s \ell^+ \ell^- $transitions are flavour-changing neutral current processes, and are thussensitive to new physics owing to potential contributions of heavy particles inthe quantum loop. Recently, LHCb has obtained interesting results, where thepossible hints of lepton family universality violation (LFUV) could be seen. Wereport a new measurement of the LFUV observable $R_{K}$, the ratio of branchingfractions of $B\to K\mu^{+}\mu^{-}$ to $B\to Ke^{+}e^{-}$, based on the fulldata sample recorded by Belle at the $\Upsilon(4S)$ resonance from $e^+e^-$collisions produced by the KEKB collider. We also report results on leptonflavor violating $B$ decays, $B^{+}\to K^{+}\mu^{\pm}e^{\mp}$ and $B^{0}\toK_{S}^{0}\mu^{\pm}e^{\mp}$. The $B$-factory at KEK is also a $\tau$ factory,creating a copious amount of $\tau\tau$ pairs. We have used these data to lookfor lepton and baryon number violating $ \tau$ decays$\tau^{-}\to\overline{p}e^{+}e^{-}$, $pe^{-}e^{-}$, $\overline{p}e^{+}\mu^{-}$,$\overline{p}e^{-}\mu^{+}$, $\overline{p}\mu^{+}\mu^{-}$, and$p\mu^{-}\mu^{-}$. Results of the search are also reported.

Test of lepton family universality and search for lepton and baryon number violation at Belle