Cesarean section rates in Indonesia increase almost double in the past five years, from 6.8% (2007) to 12.3% (2012). Very high cesarean section rates associated with adverse maternal and neonatal outcomes. The Sustainable Development Goals (SDGs) target number 10 is to reduce inequalities in all sectors, including health. The study aims to explore socio-economic inequality and factors associates to caesarean section in Indonesia. This study was a cross-sectional study using data from the 2012 Indonesian Demographic and Health Survey (IDHS). The sample study was 12,973 mothers who ever gave live-birth in the last five years before the survey. The backward logistic regression was used for analysis. Our analysis shows socio-economic inequality of caesarean section rates. Mothers with highest socio-economic status had 4-fold higher odds of caesarean section compared to lowest quintile. Furthermore, complication of pregnancy and delivery, first pregnancy, twin, had health insurance, aged more than 35 years and live in urban area had higher odds of caesarean section. Therefore, it is important to assure caesarean section based on medical indications and increase health promotion on side effect of elective caesarean section without medical indication.