  We study the Inert Higgs Doublet Model and its inert scalar Higgs $H$ as the
only source for dark matter. It is found that three mass regions of the inert
scalar Higgs can give the correct dark matter relic density. The low mass
region (between 3 and 50 GeV) is ruled out. New direct dark matter detection
experiments will probe the intermediate (between 60 and 100 GeV) and high
(heavier than 550 GeV) mass regions. Collider experiments are advised to search
for $D^\pm \to HW^\pm$ decay in the two jets plus missing energy channel.
