  We report results of a search for tau lepton decays strongly suppressed in
the Standard Model based on the world-largest data sample accumulated with the
Belle detector at the KEKB asymmetric-energy e+e- collider. The decays include:
lepton flavor and lepton number violating tau decays into a lepton (e or mu)
and two charged mesons (K or pi) as well as lepton and baryon number violating
tau decays into a Lambda and a charged meson (K or pi). The sensitivity to the
branching fractions is significantly improved compared to our previous results
and reaches O(10^{-8}).
