This study aims at clarifying the effects and significances of acts of developer for community formation, based on the contents of their acts and formation process of local activity in Rokko Island, Kobe city. The results are summarized as follows: The continuous acts of developer, from a beginning of this area, are evaluated considerably with opportunities of community upbringing, of collaborative relationship between local activity groups. As a result, in late years,"Network group", cooperated between local activities groups and companies, is established in taking support of administration.
