The purpose of this study was to examine the effects of treatments by authority in procedure. On the basis of a group-value model and the models that derive from them about procedural justice, group members are interested in group procedure to confirm their identity based on the group. We asked office employees working in a university to rate their superiors fairness and their group-oriented attitude in their organization. We found that a superior's appropriate treatment promotes employees'perception of procedural justice when the employees firmly expected to derive long-term profit in organization, while it promoted the employees' group identity in general. The evidence indicates that people are interested in group procedure because they are not only motivated to confirm their membership but also wish to maintain their group which offers them long-term profit.