  Gauge mediation provides us with a complete picture of supersymmetry breaking
and its mediation within the effective field theories, and thus allows us to
discuss consistencies with low-energy particle physics as well as cosmological
observations. We study in detail the cosmological evolution of the
pseudo-modulus field in the supersymmetry breaking sector and also the
production of the gravitinos in the early Universe in a simple (but a complete)
model of gauge mediation. Under fairly reasonable assumptions, it is found that
there exists a parameter region where dark matter of the Universe is explained
by both thermally and non-thermally produced gravitinos, while the baryon
asymmetry of the Universe is generated through the thermal leptogenesis.
