Objectives: We aimed to develop the Suicide Probability for Adolescent (SPS-A) to evaluate the possibility of suicide behaviour in adolescents.Methods: SPS-A was administered to 792 middle and high school students for examining the reliability and validity.Results: SPS-A was found to have significantly high internal consistency and total-subscale score correlations.Factor analysis yielded four factors of negative self-evaluation, hopelessness, suicide idea and hostility, which explained 53.28% of total variables.In the assessment of correlations with other suicide-related scales for the concurrent validity of SPS-A, Rosenberg self-esteem scale and Buss-Durkee hostility scale have significant correlations with SPS-A.However, Children's depression inventory and Hopelessness scale have significant correlations with SPS-A.Conclusion: We concluded that SPS-A had high reliability and validity, which is useful for evaluating suicide idea in adolescents.This study suggests that hopelessness and depressive symptoms are not for evaluating suicide risk in adolescents, unlike adult group.