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We present a measurement of $R_{K^{\ast}}$, the branching fraction ratio${{\cal B}(B\to K^\ast \mu^+ \mu^-)}$/ ${{\cal B}(B\to K^\ast e^+ e^-)}$, forboth charged and neutral $B$ mesons. The ratio for the charged case,$R_{K{^{\ast +}}}$, is the first measurement ever performed. In addition, wereport absolute branching fractions for the individual modes in bins of thesquared dilepton invariant mass, $q^2$. The analysis is based on a data sampleof $711~\mathrm{fb}^{-1}$, containing $772\times 10^{6}$ $B\bar B$ events,recorded at the $\Upsilon(4S)$ resonance with the Belle detector at the KEKBasymmetric-energy $e^+e^-$ collider. The obtained results are consistent withStandard Model expectations.

Test of lepton-flavor universality in ${B\to K^\ast\ell^+\ell^-}$ decays at Belle