This survey was performed to find out the heavy metal concentrations in shellfishes. Experimental subjects were 60 cases in 10 kinds of shellfishes purchased in markets in july, august, 1987 and february, 1988. Contents of lead, cadmium, zinc, copper and mangangese were determined by atomic absorption spectrophotometer and mercury contents by mercury analyzer. The results were as follows: The range of mercury contents in shellfishes was from ND to 0.22 ppm, cadmium from 0.22 to 2.46 ppm, lead from 0.09 to 4.90 ppm, copper from 0.62 to 12.45 ppm, manganese from 0.09 to 13.8 ppm and zinc from 4.01 to 129.96 ppm.