We investigated insect fauna of Is. Boleum-do from April to October, 2009. As a result of all the collections examined, 162 species of 59 family under 11 order were identified. Therefore, the species composition of insect diversity from Is. Boleum-do was a total of 228 species of 77 families under 11 orders including 3 endangerd species (level, Fabriciana nerippe, Lethocerus deyrollei and Copris tripartitus), 22 endermic species, 3 management of exotic species, 1 species of IUCN Red List and 42 designated species; 103 species of 18 families Lepidoptera (35.76%) which was the highest, 51 species of 18 families Coleoptera (17.72%), 44 species of 15 families Hemiptera (15.28%) and 37 species of 6 families Hymenoptera (12.85%).