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We analyzed the monthly and seasonal mean of the daily Erythemal Ultraviolet-B (EUV-B, 280~ 320 nm)irradiance operating in Pohang, Anmyeon, Gosan, Mokpo and Kangnung with UV-Biometer (Solar Light Co.,Model No. 501) at clear-sky noon during the period from 1999 to 2004. Also, we investigated the seasonal andsouthing time and the highest monthly accumulated EUV-B irradiance appeared in July and August at eachregional observatory. The monthly mean value of the clear-sky EUV-B irradiance in Pohang, Anmyeon, Gosan,Mokpo and Kangnung showed 196.6, 161.8, 221.9, 171.5 mWm-2 and 179.7 mWm-2 respectively. The annual mean value of the daily accumulated EUV-B irradiance in Pohang, Anmyeon, Gosan,Mokpo and Kangnung were 1.8, 2.1, 2.2, 1.8kJm-2 and 1.8kJm-2 respectively. The UV Index(UVI) showed aboveUVI 7(High) more than 90 days during one year over the Korean Peninsula.