  We propose a simple model where a {\it gauge invariant inflaton} is
responsible for cosmic inflation and generates the seed for structure
formation, while its relic {\it thermal} abundance explains the missing matter
of the universe in the form of cold dark matter. The inflaton self-coupling
also explains the observed neutrino masses. All the virtues can be attained in
a minimal extension of the Standard Model gauge group around the TeV scale. We
can also unveil these properties of an inflaton in forthcoming space and ground
based experiments.
