  A limit on the tau neutrino mass is obtained using all the $Z^{0} \to
\tau^{+} \tau^{-}$ data collected at LEP by the DELPHI detector between 1992
and 1995. In this analysis events in which one of the taus decays into one
charged particle, while the second $\tau$ decays into f{}ive charged pions (1-5
topology) have been used. The neutrino mass is determined from a bidimensional
\fit ~on the invariant mass $m^{*}_{5 \pi}$ and on the energy $E_{5 \pi}$ of
the f{}ive $\pi^{\pm}$ system. The result found is $m_{\nu_{\tau}}<$ 48.0
MeV/$c^{2}$ at 95% conf{}idence level.
