The purpose of this study is to standardize the State-Trait Anxiety Inventory for Children (STAIC), developed by Spielberger et al. (1973) into a Japanese version. The Japanese version of STAIC composed by the authors were tested in 2539 primary school children. On the basis of the data, mean scores, standard deviations and score distributions of A-Trait and A-State in the Japanese version of STAI