This longitudinal research examined an infant’s walking in the house for three months from the onset of walking, in order to describe where the behavior typically occurred. The beginning and end of locomotion were defined, and units of locomotion broken down into three aspects: 1. the posture at the beginning and the end of one unit, 2. locations where the locomotion began and concluded, and 3. paths of locomotion. The results for each of these aspects of locomotion were as follows, 1. Locomotion started from a sitting position in which the infant frequently touched the small objects coin- cided with carrying it at 80%. 2. From the erect position walking tended to commence in the surrounding area where the infant could hold on to items for support. 3.Loco- motion in one room was observed most frequently, though locomotion that crossed into other areas increased in the latter half of the three-month observation period. Travel diversified among areas that afforded the infant various activities, including passing through the area. However, some paths were frequently observed. These results sug- gest that the locomotion is conditioned by information of the surroundings, and the development of infant locomotion is characterized by the increasing connections to a variety of places in the house.