  Motivated by the Weyl scaling gauge symmetry, we present a theoretical
framework to explain cosmic inflation and dark matter simultaneously. This
symmetry has been resurrected in recent attempts to formulate the gauge theory
of gravity. We show the inspired inflation model is well consistent with
current observations and will be probed further by future experiments.
Furthermore, we clarify and prove the stability of Weyl gauge boson in the
general theory with multiple scalars. We show the massive Weyl gauge boson can
be a dark matter candidate and give the correct relic abundance.
