  This is the short review of Monte-Carlo studies of quark confinement in
lattice QCD. After abelian projections both in the maximally abelian and
Polyakov gauges, it is seen that the monopole part alone is responsible for
confinement. A block spin transformation on the dual lattice suggests that
lattice $SU(2)$ QCD is always ( for all $\beta$) in the monopole condensed
phase and so in the confinement phase in the infinite volume limit.
