  The H1 and ZEUS collaborations at HERA report new data on the diffractive
production of vector mesons with a many-fold increase of luminosity compared to
previous measurements. The new data include photoproduction and
electroproduction of $\rho^0,\phi,J/\psi$. The available data on elastic VM
production indicate that the interaction scales as $Q^2+M_{V}^2$.
