  In this paper we present the derivation as well as the numerical results for
all electromagnetic form factors of the nucleon within the semibosonized
Nambu--Jona-Lasinio (chiral quark soliton) model. Other observables, namely the
nucleon mean squared radii, the magnetic moments and the nucleon--$\Delta$
splitting are also computed. The calculation has been done taking into account
the quark sea polarization effects. The final results, including rotational
$1/N_c$ corrections, are compared with the existent experimental data and they
are found to be in a good agreement for the constituent quark mass of
$400$--$420\ MeV$.
