We discuss the potentialities of the nonstandard interaction study via the
Higgs boson production at photon (gamma gamma and e gamma) colliders. We es
timate the scale of new physics phenomena beyond the SM that can be seen in
the experiments with Higgs boson production. In particular, the effect of
new heavy particles within the SM is shown to be quite observable. [S0556-2
821(99)04907-3].