We provide a gauge-mediation model of dynamical supersymmetry breaking wher
e the gravitino mass takes a value in a wide range from 0.1 eV to 10 GeV. T
he lower mass region of order 100 keV or less deserves experimental and cos
mological interests. The vacuum of our model is a true one without runaway
instability, which may be desirable in a cosmological evolution of the univ
erse. (C) 1999 Published by Elsevier Science B.V. Ail rights reserved.