Low self-esteem and attachment can affect students in their social skills. Some students who live apart from their parents to continue their studies experience have a difficulties in finding friends and can be accepted in the new social sphere. The purpose of this research is to find out whether there is a relationship between attachment and self-esteem on the social skills of students who live alone in boarding. Participants in this study were 104 active students who lived alone in boarding. The data analysis technique used in this study is multiple linear regression. Viewed from the F test of 27,249 with a significance of 0.000 (α <0.05), then together attachment and self-esteem have a significant relationship with social skills. The relationship between attachment and self-esteem with social skills can be interpreted that attachment and self-esteem are factors that can predict how the social skills of students who leave home and live in boarding. A good relationship between parents and adolescents will help teens interact and improve their identity and skills in the environment. Individuals who value themselves valuable will influence the way they interact and adjust to the new social environment. In a new residential environment students living in boarding houses must be able to socialize well with friends in boarding or guards and neighbors boarding, so that they can live with each other especially when in difficult conditions such as illness, because they live far from their parents.