Results: The validity of the JNHS-FFQ was examined on the basis of the dietary intakes documented in the two 7dDRs. The median Pearson’s correlation coefficient was 0.39 for crude total energy intake and 0.34 for energy-adjusted intake. The energy intake estimated from the JNHS-FFQ was higher than the actual intake according to the DRs, and the correlation coefficients between the DRs and JNHS-FFQ data ranged from -0.04 (iodine) to 0.62 (copper) for crude intakes and -0.12 (zinc) to 0.56 (polyunsaturated fat) for energy-adjusted intakes.