Diabetes mellitus patients often have difficulty in self care perform, especially in term of medication, diet, or activities. Good family support was needed to help patients achieved self-care adherence. The aims of this study were determined the role of family support to medication, diet and activity of type 2 diabetes mellitus patients. Observational studies with cross sectional techniques were used in this study. As many as 68 respondent involved in this study were taken using purposive with inclusion criteria such as patient who over 25 years, was diagnosed with type 2 diabetes mellitus at least one year, outpatients registered, and was willing to be a respondent. The number of samples was taken by purposive sampling technique as musch as 68 respondents. This study was used chi Pearson correlation analysis. This study was showed average of respondent ages are 61 years, had 33 score of family support, had 22 score of medication adherence, and had 40 score of diet and activity adherence. Statistical analysis of this study was showed that only family support has a correlation with diet and activity adherence (p value 0.000; CI 95%). It is necessary to provide knowledge and motivation to families in order to increase support for diabetes mellitus patients in perform their self care, especially in terms of medication, diet and activity.