The purpose of this study was to explain cooperation between day care centers teachers, preschools teachers and elementary schools teachers of five years old children teachers, first grade teachers and teachers of special needs classrooms in elementary schools in the X city. In the result, teachers of special needs classrooms in elementary schools recognized the need to use the tool when they cooperate between day care centers and preschools. And, the most important thing about cooperation among day care centers, preschools, and elementary schools was “the opportunity to share information on children with special needs.” From this, they think that transition to elementary schools needs more individualized information including parents’ wishes. On another front, five years old children teachers, first grade teachers, and teachers of special needs classrooms in elementary schools conduct“ conference before school age” at the highest rate.