  In the Standard Model (SM) the couplings of the Higgs boson to SM particles
and itself (self-couplings) are uniquely specified once the masses of the
particles in question as well as the Higgs boson mass are given. Precision
measurements of these couplings in the future collider experiments are the key
to either verifying the mechanism of the electroweak symmetry breaking in the
SM or uncovering physics beyond the SM. This article gives an overview of how
various Higgs couplings will be measured at the ILC. Emphasis is put on the
ILC's capability of performing fully model independent determination of
absolute $HZZ$ and $HWW$ couplings, the Higgs total width, and hence various
other Higgs couplings, which cover essentially all the crucial ones including
the top-Yukawa coupling $Htt$ and the trilinear Higgs self-coupling
$\lambda_{HHH}$. The strategy to get the best precision measurements at the ILC
is through staged running, which provides many independent
$\sigma\times\mathrm{Br}$ measurements for different production channels and at
different energies. A method of global fitting is discussed to utilize all of
the available information and to derive combined precisions.
