  The origin of the lightest scalar mesons is studied in the framework of
instanton liquid model (ILM) of the QCD vacuum. The impact of vacuum
excitations on the sigma-meson features is analyzed in detail. In particular,
it is noticed that the changes produced in the scalar sector may unexpectedly
become quite considerable in spite of insignificant values of corrections to
the dynamical quark masses and then the medley of sigma-meson and those
excitations may reveal itself as broad resonance states of vitally different
masses.
