  We present the discovery of a substellar companion to the primary host lens
in the microlensing event MOA-2012-BLG-006. The companion-to-host mass ratio is
0.016, corresponding to a companion mass of $\approx8~M_{\rm Jup}
(M_*/0.5M_\odot)$. Thus, the companion is either a high-mass giant planet or a
low-mass brown dwarf, depending on the mass of the primary $M_*$. The companion
signal was separated from the peak of the primary event by a time that was as
much as four times longer than the event timescale. We therefore infer a
relatively large projected separation of the companion from its host of
$\approx10~{\rm a.u.}(M_*/0.5M_\odot)^{1/2}$ for a wide range (3-7 kpc) of host
star distances from the Earth. We also challenge a previous claim of a
planetary companion to the lens star in microlensing event OGLE-2002-BLG-045.
