  A huge value of cosmological constant characteristic for the particle physics
and the inflation of early Universe are inherently related to each other: one
can construct a fine-tuned superpotential, which produces a flat potential of
inflaton with a constant density of energy $V=\Lambda^4$ after taking into
account for leading effects due to the supergravity, so that an introduction of
small quantum loop-corrections to parameters of this superpotential naturally
results in the dynamical instability relaxing the primary cosmological constant
by means of inflationary regime. The model phenomenologically agrees with
observational data on the large scale structure of Universe at
$\Lambda~10^{16}$ GeV.
