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We present the first measurement of the Michel parameters $\bar{\eta}$ and$\xi\kappa$ in the radiative leptonic decay of the $\tau$ lepton using 703f$\mathrm{b}^{-1}$ of data collected with the Belle detector at the KEKB$e^+e^-$ collider. The Michel parameters are measured by an unbinned maximumlikelihood fit to the kinematic information of$e^+e^-\rightarrow\tau^+\tau^-\rightarrow (\pi^+\pi^0\bar{\nu})(l^-\nu\bar{\nu}\gamma)$ $(l=e$ or $\mu)$. The preliminary values ofthe measured Michel parameters are $\bar{\eta} = -2.0 \pm 1.5 \pm 0.8$ and$\xi\kappa = 0.6 \pm 0.4 \pm 0.2$, where the first error is statistical and thesecond is systematic.

Measurement of Michel Parameters ($\bar\eta$, $\xi\kappa$) in the radiative leptonic decay of tau at Belle