We investigated the prevalence of infectious duck diseases using 156 ducks reared in 18 farms of western Gyeong-nam province. As a result, duck viral hepatitis (12.8%), colibacillosis (7.1%), and fungal disease (9.0%) were detected. However, avian influenza and riemerellosis were not detected. During autopsies, we could grossly observed red swollen liver (12.8%), petechial or ecchymotic hemorrhage on liver (11.5%), and fibrinous perihepatitis (9.0%). Gray-white necrotic spot (23.1%), swollen spleen (22.8%), swollen kidney (20.5%), hyperemia or hemorrhage on tracheal mucous membrane (8.3%), and nodule in long or air sac (9.0%) were also found.