Eight species of the family Oedicerotidae are described from soft bottoms of Korea. Six of them represent new species belonging to the genera Monoculodes (3 spp.), Perioculodes (1 sp.) and Synchelidium (2 spp.), one is S. lenorostralum Hirayama, herein raised to specific rank, and the seventh new species is assigned to a new genus, Chitinomandibulum. This genus is closely related to the sympatric genus Synchelidium.