  The charge form factor of the pion is calculated for momentum transfer range
of Jefferson Lab experiments. The approach is based on the instant form of the
relativistic Hamiltonian dynamics. It is shown that the form-factor dependence
on the choice of the model for quark wave function in pion is weak, while the
dependence on the constituent--quark mass is rather significant. It is possible
to estimate the mass of constituent quark and the sum of anomalous magnetic
moments of $u$- and $\bar d$- quarks from the JLab experiments.
