A survey was conducted to determine the concentrations of six heavy metals, namely Fe, Cu, Zn, Pb, Hg and Cd, in the sea water off Jinhae and Masan during January and February, 1974. The contents of Fe, Cu and Zn were the highest in Masan Bay, and decreased in order of Haengam Bay, Ungcheon area and Ungdong area. The Fe concentrations showed significant differences particulary in Masan Bay by depth. All of these characteristic would contribute to the assumption that the pollution might have originated from Masan. Pb contents varied in the range of 1.0-7.0 $mu extrm{g}$/l, but Haengam water contained the lowest concentrations of all areas surveyed. The contents of Hg and Cd showed 0.1 $mu extrm{g}$/l through survey regions respectively.