It is widely accepted that the characteristics of the sedentism in 'Jomon' (i.e., Mesolithic in Japan) have gradually developed, but the data for it is mostly based on the examples in Eastern Japan. This paper therefore outlines the early sedentism not only in Eastern Japan but also in Western Japan by focusing on the relationship between house structures and stone tools for creating a living space, and then compares the characteristics of these two areas. In addition, in order to put the early sedentism of Jomon into the context of World Prehistory, the comparison with the nature of the early sedentism in British Isles is attempted.