As a result of decentralization, the role which local municipalities fill in Japanese administration has become still more important. In this research, the relationship between the perceived fairness of decision-making by municipalities and people's attitudes to the region was examined. According to conventional studies on procedural justice, it has been confirmed that people use group authority as a cue to the fairness of decision-making and their attachments to the group are strengthened according to that perceived fairness. We conducted a questionnaire survey of residents in Sapporo and confirmed that city personnel tend to become a psychological factor in the perceived fairness of municipal administration. In addition, we confirmed that people in a low-income bracket tend to strengthen their attachments to their region through perceived fairness and to hold optimistic prospects concerning their livelihood.