Probhems and aims. : speaking, there are two aspects in the jud gement of items Generally a social attitude scale. The one (S) is that in which the items are judged in terms of agreements with the statements of the attitude scale, and the other (S') is that in which they are judged in terms of oppositions to the statements. When examined statistically. S-S' has a significant difference which was ,deinonstrated byour previous researches. And then, why is the difference significant? I will be able to point out, as one of the chief reasons, that the mechanism in the judgernent of S is different from that of S'. precisely, attitudes are always:) related to definite stimuli or stimulus situations. (subject-object relationship). The concept of attitudes are often de noted in termsof its objects. but the conteht of an attitude is deci.ded by the property of the subjectobject relationship which has established at that time, and which has fulfilled the important role as a parameter. Therefore, in order to explain the bi-polarity of social attitude, we will adopt the mechanism of value and the mechanism of radicalism-conservatism, as examples of subject-object relationship, and examine them experimentally.