  The decays $\bar{B} \rightarrow D^{(*)} \tau^- \bar{\nu}_\tau$ are good
probes to new physics beyond the Standard Model. The ratios of branching
fractions $R(D^{(*)}) \equiv \mathit{BF}(\bar{B} \rightarrow D^{(*)} \tau^-
\bar{\nu}_\tau) / \mathit{BF}(\bar{B} \rightarrow D^{(*)} \ell^-
\bar{\nu}_\ell)$ (where $\ell^- = e^-, \mu^-$) measured by Belle, BaBar and
LHCb show 3.9$\sigma$ deviation from the SM expectations as of 2015. In 2016,
the Belle collaboration has shown two new measurements for the $\bar{B}
\rightarrow D^{(*)} \tau^- \bar{\nu}_\tau$ decay. These include the first
application of the semileptonic tagging to the $R(D^*)$ measurement and the
first measurement of the $\tau$ polarization using the hadronic $\tau$ decays.
We also review the two measurements for $B^- \rightarrow \tau^- \bar{\nu}_\tau$
at Belle. Along with these results, compatibility with the type-II
Two-Higgs-Doublet Model is discussed.
