The purpose of this study was to develop the norms and to test the reliability and validity of the Korean version of the Parenting Stress Index (K-PSI). Following the recommended 3-step translation process, the K-PSI was administered to the parents of 1,919 typically developing children (age range: 1 to 12 years). The reliability was tested via internal consistency and test-retest reliability (N=35). Its construct validity was examined by administering the K-CBCL (preschoolers=527, school-aged children=71) and the BDI (N=89). The discriminant validity was assessed by administering the K-PSI to the parents of children with developmental disabilities (N=96). The results of cinfirmatory factor analysis indicated that similar factor structures exist for both the PSI and K-PSI, although cross-cultural differences wer suggested. Overall, the results showed high internal consistency (.56 to .95), test-retest reliability (.50-.90) and construct (.40-.69) and discriminant validity, and this suggeted that the K-PSI were valid psychometric properties. We also discussed the implication of using the K-PSI both as a clinical tool and a research instrument.