Infants are more likely to imitate actions on objects than body movements (Rogdon & Kurdek, 1977). A recent developmental theory assumes the relationship between body imitation and understanding of other’s mental states such as intention (Meltzoff, 2004), but there are few evidence on such relationship. The present study was aimed to reveal the developmental linkage between body imitation and understanding of other’s intention in infancy. Twenty-two participants visited longitudinally at 13, 15, and 17 months of age. We conducted imitation tasks (object manipulations, gestures, and non-meaningful actions) at 13 and 17 months, and task of understanding of other’s intention at 15 months. Results showed a developmental path from imitation (non-meaningful actions) at 13 months to understanding other’s intention at 15 months, and also from understanding other’s intention at 15 months to imitation (gesture and non-meaningful actions) at 17 months. The relationship between imitation and understanding other’s intention will be discussed.