I exposed rats to chlordane (industrial product) and measured the concentration of chlordane in various tissues of rats over time. Exposure to chlordane for 3.5 hours appoximated the exposure to chlordane in a house a hundred days after treatment for termites. However, chlordane and metabolites were detected in all the tissues of rats. The concentration of chlordane in various tissues showed highest level one hour after exposure. After that, heptachlor, γ-chlordane, trans-chlordane and cis-chlordane were excreted fast, while trans-noachlor and cis-nonachlor were excreted extremely slowly. The metabolites of chlordane (heptachlorepoxide and oxichlordane) showed the highest level one after exposure in the various tissues, and after that they were excreted slowly. Chlordane had the highest level in the adipose tissue and the second highest level in the liver, kidney, lung, pectoral muscle and heart. In the spleen and brain it showed a relatively low level. The lowest level was in the blood. As for Biological Harf Life (B.H.L.), the number of days in the secondary excretion in the adipose tissue of chlordane excreted late was as follows: trans-nonachlor 38.5 days, cis-nonachlor 16.5 days, and metabolites 16.9 days. It is suggested that the chronic toxicity of trans-nonachlor, cis-nonachlor and metabolites should be investigated in future.