  This paper suggests a generalization of the Born--Infeld action (1932) for
the case of electroweak and gravitational fields. Basic notions one deals with
are Dirac matrices, $\gamma_{a}$, and dimensionless covariant derivatives,
$\pi_{a} = - i\ell \nabla_{a}$, given in spinorial and scalar representations.
The action contains a characteristic length $\ell$ (which is of order of
magnitude of Planck's length), as a parameter and possesses an extra symmetry
with respect to transformations of the Lorentz group imposed on pairs
($\gamma_{a}$, $\pi_{a}$). It's shown that parameter of the Lorentz group is
associated with a constant value of the electroweak potential at spatial
infinity.
