The environment is very important to the human being, most of all, infant is sensitive to the environment because infant is on the way to the brought-up. The Furniture in living space is a medium to connect a house and dweller, and is intimately relate to the living environment. Therefore we have to consider the infant various behavior for the plan of infant furniture. But studies on the infant seems not to have concern of infant environment as a living. Specialty, the demands of the adults for space is up to express in living space, but that of infant is latent. Also the demands of infant is difficult for the adults to be understood. So the studies on the infant furniture through the Infant playing behavior have to be achieved for the proper infant cultural environment.