To determine the optimal salt concentration in low-salted Oiji (a traditional Korean cucumber pickle), the salt in the cucumber was maintained at five concentrations (ranging from 1% to 5%), and the physicochemical (moisture content, salinity, pH, acidity, and hardness) and sensory (acceptance test and difference test) characteristics of the Oiji were studied. The moisture content and hardness in Oiji were highest at a salt concentration of 1%, and the salinity was highest at a salt concentration of 5%. The pH of Oiji was lowest at a salt concentration of 1%. The acceptance test of Oiji indicated that the best appearance occurred at 1% salt concentration and the best flavor and texture at 4%. Additionally, the maximum taste and overall acceptance were recorded at a salt concentration of 3%. The salty taste of Oiji was greatest at a salt concentration of 5% and lowest at 1%. The taste of Oiji was most bitter and had the most intense brown color at a salt concentration of 3%. The acidity, crispness, and hardness were high when the cucumbers were soaked in solution containing 3% salt or more. Overall, the results of this study showed that the optimum concentration of salt for the preparation of Oiji was 3%.