In community development, problems such as the immobilization of participating players and the difficulty of encouraging the participation of diverse citizens have been pointed out. We therefore conducted a survey on the willingness to use a digital platform for co-creation community development, using a community development project with citizen participation in Oyama City, Tochigi Prefecture, as a case study. Semi-structured interviews were conducted with question items derived from theories on community empowerment, and questionnaires were administered and statistically analyzed to generalize the implications of the coding results. The results confirmed that digital platforms increase the diversity of citizen participation, and the two propositions that "people who are connected to the community and feel the significance of being involved in government are more likely to use digital platforms" and "altruistic people with a low sense of community are more likely to use digital platforms" were derived.