This study developed the children's versions of the Strengths Knowledge Scale and Strengths Use Scale, and examined their reliability and validity. The participants were 121 elementary school students in the fifth and sixth grades. The children's versions of the scales showed a single-factor structure, and their internal consistency and high test–retest reliability were confirmed. In addition, strengths knowledge and strengths use were moderately negatively correlated with overall stress response, irritated-angry feeling, and helplessness. These findings provided support for the reliability and validity of the children's versions of the Strengths Knowledge Scale and Strengths Use Scale.