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A potential of near infrared spectroscopy to measure inorganic components of seawater as salt-manufacturing materials was investigated. A total of 72 seawater samples collected from six spots were used and spectra (1100-1800nm) were acquired by a NIRSystem 6500 spectrophotometer with 1-mm sample thickness. Principal component analysis (PCA) and partial least squares (PLS) regression were performed. As results, the principal component analysis showed that the near infrared spectra could be related to the inorganic component of seawater. And partial least squares regression analysis showed that the inorganic components (ion concentration of Cl, Na, K, SO4 and Ca) could be predicted in good accuracy using original near infrared spectra or second derivative spectra. Especially, the high measurement accuracy was provided for Cl-ion and K-ion concentration.