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We report the first measurement of the $D^{\ast -}$ meson polarization in thedecay $B^0 \to D^{*-} \tau^+\nu_{\tau}$ using the full data sample of772$\times 10^6$ $B\bar{B}$ pairs recorded with the Belle detector at the KEKBelectron-positron collider. Our result, $F_L^{D^\ast} = 0.60 \pm 0.08 ({\rmstat}) \pm 0.04 ({\rm sys})$, where $F_L^{D^\ast}$ denotes the $D^{\ast-}$meson longitudinal polarization fraction, agrees within about $1.7$ standarddeviations of the standard model prediction.

Measurement of the $D^{\ast-}$ polarization in the decay $B^0 \to D^{\ast -}\tau^+\nu_{\tau}$