This quantitative research aims to determine the relationship between parent attachment and premarital sexual behavior in early adolescents. Until this research was 150 young people aged 12-15 years old using accidental sampling method. The measuring instrument used in this study is an Inventory of Parent and Peer Attachment (IPPA) measuring instrument which is divided into 2 parts, namely for father and mother, while sexual behavior is "Sex: A User's Manual" adapted from Soetjiningsih (2008). The data analysis technique used in this study is the Spearmen correlation. The results of the analysis showed that there was a significant relationship between parent attachment (mother) and premarital sexual behavior in early adolescents, and the same result was a relationship between parent attachment (father) and premarital sexual behavior in early adolescents. Furthermore, teenagers who are close to their parents feel given the trust so they do premarital sexual behavior.