To clarify the relationship between renal stone formation and the diet, the consumption of various nutrients of calcium stone formers was investigated. The study included 24 male and 12 female stone formers, between 20 and 78 years old (mean 42 years). The daily consumption of nutrients was compared to the daily nutritive requirement for the Japanese. The amounts of total and animal protein ingested by all the patients were significantly larger than the daily nutritive requirements. The animal protein ratio was also significantly higher. Concerning the total protein, animal protein and animal protein ratio, male and female patients showed similar results. Salt consumption was significantly larger for all the patients and the male patients than the daily nutritive requirement for the Japanese. Female stone formers also showed this tendency. Consumption of calcium and carbohydrate by all the patients and the male patients was significantly smaller than the daily nutritive requirement. This tendency was observed for the female patients.