To assure the safety of the major edible seaweeds, we collected the 176 samples of seaweeds such as laver(Porphyra sp.), sea mustard (Undaria pinnatifida), sea tangle (Laminaria japonica) and sea lettuce (Enter-omorph sp.) from Korean coast. We investigated the contents of the trace metals in the edible seaweeds, and the values were expressed as the dry weight of sea weeds. The mean levels of the trace metals were high in the oder of Zn ($36.19{pm}27.14 ;{mu}g/g$), Mn ($28.75{pm}28.03;{mu}g/g$), and Cu ($6.82{pm}7.62;{mu}g/g$), which are necessary metals in the human body, and then followed by Cr ($1.54{pm}2.07;{mu}g/g$), Ni ($1.29{pm}2.57;{mu}g/g$), Pb ($0.89{pm}1.11;{mu}g/g$), Cd ($0.72{pm}0.80;{mu}g/g$) and Hg ($0.01{pm}0.02;{mu}g/g$). The contents of Cd and Zn were high in the laver, Cr, Ni and Pb were detected highly in sea lettuce, and Hg was detected highly in sea tangle. Significant linear correlations were obtained among 28 different pairs of metals, some of them highly correlated (r>0.5, p<0.05),such as Ni-Mn, Zn-Ni, Cu-Pb and Cu-Zn in laver, Ni-Zn in sea mustard, Cu-Pb, Cu-Zn and Mn-Pb in sea tangle, and Ni-Cr in sea lettuce. And, the trace metal contents of seaweeds varied with parts and kinds of samples. The average weekly intakes of Hg, Cd and Pb from seaweeds were about $0.07{~}3.57\%$ of PTWI (Provisional Tolerable Weekly Intakes) which has set by FAO/WHO to evaluate the safeties of trace metals in food. Therefore, it was found that they showed very safe levels in the edible seaweeds.