  We investigate the Mott transitions in the two-orbital Hubbard model with
different bandwidths. By combining dynamical mean field theory with the exact
diagonalization, we discuss the stability of itinerant quasi-particle states in
each band. We demonstrate that separate Mott transitions occur at different
Coulomb interaction strengths in general, which merge to a single transition
only under special conditions. In particular, it is clarified that the $xy$ and
pair-hopping components of the Hund coupling play a key role to control the
nature of the Mott transitions.
