Joint attention is a process to look at the object that someone is looking at. Previous studies in developmental psychology have suggested that the ability to achieve joint attention is acquired between 6 and 18 months old and that it plays an important role in infants’ further cognitive development. We investigate what inherent mechanisms enable infants to acquire the ability, how their perceptual and motor development influence the learning, and how caregivers support their development (Nagai et al., 2003, 2006).