In order to promote research on minorities that reflects the perspectives and values of minority members, co-production of research with the participation of the minorities is important. However, there are many issues to be addressed in its implementation. In order to collaborate on an equal footing with the expert community, which has been sharing and updating its knowledge synthetically and diachronically, it is necessary to have a counterpart community of minorities who also share and update their own knowledge. However, in the same way that the expert community is divided vertically by field, the minority community also tend to be divided vertically by similarities in hardships and needs. In addition, a community of people who are united by similarity will have a center-periphery structure, and marginalized members may be oppressed. Historically, tojisha-kenkyu was born as a way to give expression to the experiences of the marginalized members of the community, but if the silo structure of the community is preserved, it can become a technique that forces the marginalized members to over-adapt. In order to realize co-production, both the expert community and the minority community must be able to honestly express what they know in a safe place, acknowledge the limitations of their own knowledge and the existence of members and experiences that are marginalized by it. We must have a humble attitude toward the knowledge of other research communities, and make organizational changes to continue to try to increase our objectivity by bringing in a variety of perspectives from outside the periphery.
 Author's abstract