Abstract
The purpose of the present study was to develop a Japanese version of the Children's Depression Inventory (CDI; Kovacs, 1992) . Participants were 370 students (179 boys, 191 girls) from 9 to 15 years old. The results of confirmatory factor analysis revealed that the Japanese version of the Children's Depression Inventory had 1 factor. The reliability of the Children's Depression Inventory was investigated by Cronbach's a; its validity, through correlation with the Youth Self Report test (Kuramoto et al., 1999, in Japanese) . The results indicated that the Children's Depression Inventory had high reliability and validity. The average total score on the Japanese version of the Children's Depression Inventory was high compared with that on the original English-language edition. Higher scores than the clinical cut-off score of the English version were obtained by 14.9% of the participants. The sample size in the present study was not large enough to enable standardization of the Children's Depression Inventory; furthermore, the present study was conducted only with a non-clinical sample. Further research with large normative and clinical samples is necessary to confirm the factor structure, reliability, and validity of the Japanese version of the Children's Depression Inventory.
