The article on the results of this research contains a discussion of the study of the social function of the oral tradition text of lullaby song coastal region of the Minangkabau collective in West Sumatra. The Minangkabau collective coastal region in West Sumatra is represented by three regions, namely Padang City, Padangpariaman District and Pesisir Selatan District. This research is a descriptive qualitative research. Social function data were obtained through tracing the structure (format and content) of the lullaby song text and the results of interviews from informants in three Minangkabau collective coastal areas in West Sumatra. This study of social functions uses the theory of the study of cultural values as used by Danandjaja (1984), Djamaris, et al. (1993), Teeuw (2000, Rusyana (2000), and Hasanuddin WS, et al. (2019). Based on the research findings, the contents of the text of the oral tradition of lullaby song coastal region of the Minangkabau collective in West Sumatra contain teaching pointers in the form of noble advices. The text of has at least three social functions, namely (i) an expressive function, namely a function to convey feelings, thoughts, and attitudes to life, (ii) a directive function, namely a function to teach the cultural values of the main characters through advice, messages, and hopes, and (iii) aesthetic function, namely presenting the beauty of language, a sense of comfort, calm, and well-being, as well as evoking sleepiness for those who listen to it, especially children.