Higgs Physics as a Proble of New Physics

The discovery of the Higgs boson at the LHC has opened the door to clarify the mechanism of electroweak symmetry breaking and the origin of masses of particles. The Higgs sector in the SM is the simplest but has no theoretical principle, so that there is a possibility of non-minimal Higgs sectors. While the standard model is not contradict with the current data at the LHC within the error, most of extended Higgs sectors can also reproduce the data. An extended Higgs sector often appears in a new physics model beyond the standard model, so that we can determine new physics from the Higgs sector. In this talk, we discuss various aspects of extended Higgs sectors, in particular its phenomenological properties and testability at future experiments at the International Linear Collider.