  The quark-meson coupling model, based on a mean-field description of
non-overlapping nucleon bags bound by the self-consistent exchange of $\sigma$,
$\omega$ and $\rho$ mesons, is reviewed. In particular, I present the changes
in the hadron masses of the (non-strange) vector mesons and the nucleon in a
nucleus. I also give a new, simple scaling relation among the changes of the
hadron masses.
