The authors investigated estimated amounts of salt intake of workers in manufacturing industries who consisted of 1,506 males in 6 manufacturing fields and 476 females in 3 fields in Pusan area using filter paper method which was developed recently. The obtained results were as follows; 1. Mean excretion amounts of urinary electrolytes were Na 200.7 mEq/l, K 44.2 mEq/l and Cr 1.12g/l in male and Na 190.2 mEq/l, K 44.0 mEq/l and Cr 1.10g/1 in female. 2. Mean daily salt intake amounts were 19.4g in male and l5.3g in female. 3. By the fields of manufacturing industries in male, workers in metal product field had the highest salt intake as 20.0g, and the following were workers in food and tobacco field as 19.7g, workers in textile, wearing apparel and leather field as 19.6g in order. 4. In female, workers in textile, wearing apparel and leather field had the highest salt intake as l5.7g and the next were workers in chemical, coal and rubber products field as l5.0g and workers in fabricated metal products, machinery and equipments as l4.3g, respectively.