The present invention relates to a novel porcine epidemic diarrhea virus (PEDV) Korean isolate. The present invention relates to a porcine epidemic diarrhea (PED) vaccine composition containing, as an active ingredient, the virus, a culture of the virus, or an antigen therefor. In addition, the present invention relates to a pharmaceutical composition for preventing or treating porcine epidemic diarrhea (PED), containing, as an active ingredient, the virus, a culture of the virus, or an antigen therefor. In addition, the present invention relates to a composition for diagnosing porcine epidemic diarrhea (PED), containing, as an active ingredient, the virus, a culture of the virus, an antigen therefor, or an agent capable of detecting the virus. In addition, the present invention relates to a pharmaceutical composition for preventing or treating porcine epidemic diarrhea (PED), containing an inhibitor of growth of the virus.