アブストラクト：
We present optical properties of infrared-bright (IR-bright) dust-obscured galaxies (DOGs). DOGs are believed to be a candidate population that are evolving to quasars from gas-rich mergers. However, the formation and evolution of DOGs are observationally still unclear. By combining three multi wavelength catalogs of optical (HSC), near-IR (VIKING), and mid-IR (ALLWISE), we have discovered 427 IR-bright DOGs. By analyzing the optical color of selected DOGs, we found that star-formation (SF)-dominated DOGs show a relatively red color while active galactic nucleus (AGN)- dominated DOGs show a rather blue color. This result can be interpreted by the leak of the AGN light from the dusty nucleus.