Since Miyamoto & Lee (1966) first recorded three species of Miridae, many species including new species are added to the fauna of Korea by several Korean and foreign taxonomists (Josifov, 1992; Josifov & Kerzhner, 1972; Lee & Kwon, 1991; Lee et al., 1993; Lee et al., 1994). Kwon et al. (2001) collectively arranged the Korean fauna of Miridae into 7 subfamilies, 84 genera, and 209 species, but many species have been believed to remain unrecorded. During recent the recent study of Miridae, we found three unrecorded species, Apolygus roseofemoralis (Yasunaga 1992), Pachylygus nigrescens (Kerzhner 1977), Deraeocoris yasunagai Nakatani 1995. The brief information on them are presented with the photos of specimens. All specimens are deposited in NIAST.