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The Belle II experiment is a substantial upgrade of the Belle detector andwill operate at the SuperKEKB energy-asymmetric $e^+e^-$ collider. The designluminosity of the machine is 8$\times10^{35}$ cm$^{-2}$s$^{-1}$ and the BelleII experiment aims to record 50 ab$^{-1}$ of data, a factor of 50 more than itspredecessor. From February to July 2018, the machine has completed acommissioning run and main operation of SuperKEKB has started in March 2019.Belle II has a broad $\tau$ physics program, in particular in searches forlepton flavor and lepton number violations (LFV and LNV), benefiting from thelarge cross section of the pairwise $\tau$ lepton production in $e^+e^-$collisions. We expect that after 5 years of data taking, Belle II will be ableto reduce the upper limits on LFV and LNV $\tau$ decays by an order ofmagnitude. Any experimental observation of LFV or LNV in $\tau$ decaysconstitutes an unambiguous sign of physics beyond the Standard Model, offeringthe opportunity to probe the underlying New Physics. In this talk we willreview the $\tau$ lepton physics program of Belle II.

Prospects for $\tau$ Lepton Physics at Belle II