Acrolepiopsis nagaimo (Yasuda, 2000) belonging to the family Acrolepiidae (Lepidoptera) is newly discovered in Korea. The species was first collected wild at Wol-ak-san [Mt.] a few years ago and they were recently found to infest Chinese yam, Dioscoreabatatas at a Chinese yam experimental field of the Institute for Bioresources Research located at Andong. Diagnostic characteristics of the adult are described and photographs of adult and male and female genitalia are provided.