Patriarchal household system was prevailed earlier in Japan in which many generations lived together. They all lived together under the control of the head of the house. As people became effluent, new ideas of the family came into being. The new home was of nuclear family in which husband and wife are both bread-makers as well as home-makers. The old patriarchal system began to break; this new system also generated demands for new types of domestic goods and new forms of housing.