Pre-primary education has become popular strategy to protection drop-out from formal education of children all over the world. It has a strong and positive impact on further learning during the primary level and beyond. Pre-primary education is very important for the development of young children before they enter formal school. It helps in cognitive development of children at the early grades of primary education and it has strong bearing on attendance and participation of children once they enter primary school. So, protection drop-out from formal education of child is most necessary for a nation. For this reason pre-primary education is especially important for a nation. This article is about school younger children between the ages of three and five or seven, prior to the start of compulsory education. In this article I have investigated the role of governments of Japan in pre-primary schooling. The main objective of this paper is to study nature of pre-primary education, infrastructure, target group, curriculum, school activity and relationship among teacher, parents and student in pre-primary sector. This paper focuses how the daily activities and routines of Japanese preschool day constitute an unwritten curriculum for socializing children in the fundamental habits and attitudes of group life in Japan.