In this research, we aim to foster the ability to propose a sustainable living environment in a three-dimensional space trying to organize a lesson in order to clarify the image of the child in the living space: "house". First, we revealed the change of the image of the "house" of the fourth graders through the model making: the children have become conscious of their own life on the durability of the house, or the attachment to the ground through the experience of model making. In addition, we found their interest to the exterior space.