  We report a study of $\tau$ lepton decays involving $\Ks$ with a 669
fb$^{-1}$ data sample accumulated with the Belle detector at the KEKB
asymmetric-energy $e^{+}e^{-}$ collider. The branching fractions have been
measured for the $\tauTO \piKs \nu_{\tau}$, $\KKs \nu_{\tau}$, $\piKspizero
\nu_{\tau}$, $\KKspizero \nu_{\tau}$, $\piKsKs \nu_{\tau}$ and $\piKsKspizero
\nu_{\tau}$ decays. We also provide the unfolded mass spectra for $\tauTO
\piKspizero \nu_{\tau}$ and $\tauTO \KKspizero \nu_{\tau}$.
