Recently, the huge quantity of plastic waste floating on the world''s oceans was swept Korea ashore. Bisphenol A (BPA) and styrene oligomer (styrene monomer, styrene dimer and styrene trimers) eluted from floating plastic waste become instigators of disrupted endocrine function and related human health problems. Therefore, to investigate the contamination degree of the coastal areas by the drifting polystyrene materials, we perfomed the field investigation of Korea coasts - East Sea, South Sea, West Sea, and Jeju Island by using GC/MS. In East Sea, concentration of BPA was detected in 0.96 to 23.8 ng/mL range, and BPA values of West Sea and South Sea were detected in 2.20 to 4.95 ng/mL and from 2.16 to 6.11 ng/mL range, respectively. Also, in all of Korean coastal area, Styrene Monomer (SM) was detected in lower concentration and Styrene Trimer (ST) showed relatively higher concentration. Futhermore, concentraion of styrene oligomer (SM, SD, and ST) showed the highest value at coast of Jeju Island among them. These results indicate that plastic marine debris is the cause of the new marine environmental hormonal pollution in Korea coastal areas.