  The discovery of the Higgs boson like particle with the mass of around 126
GeV has given us a great clue to know what is the true Higgs sector. New
physics models at the TeV scale often introduce Higgs sectors extended from the
minimal form, so that the determination of the Higgs sector can be a probe of
new physics models. In this talk, we focus on the Higgs sector with exotic
representation fields whose isospin is larger than 1/2. We first discuss the
general features of exotic Higgs sectors, and then we consider several concrete
models to clarify them. The phenomenology of the Higgs triplet model is
discussed as the simple but important example.
