The purpose of this study was to construct a moral judgement scale for the Japanese adolescent based on Kohlberg's theory and to examine its validity. The questionnaire was constructed with reference to Defining Issues Test, and administered to 115 high school- and 186 college-students. A considerable number of these subjects were interviewed after Kohlberg's original method and tested on their vocabulary. Results were as follows: (a) Differences among stages as measured by the questionnaire were developmentally significant; (b) the correlation between the scores of the questionnaire and of Kohlberg's method was comparatively high; and (c) the correlation between the vocabulary test score and the moral judgement score was low. It was concluded that this scale is valid for measuring moral development.