Passive smokers are more at risk of disease than active smokers. One of the diseases is Acute Respiratory Illness (ARI). The aim of this study was to obtain the sociodemographic profile of passive smokers with ARI in Indonesia and associated factors with ARI among children under-five based on Riskesdas 2013 data. The method of this study was cross-sectional, data taken from 497 districs/cities consisted of 33 provinces. Sample was respondent who has been exposed to cigarette smoke from one or more household members who smoked in the house. The results showed that prevalence of passive smokers in Indonesia was 58,9%, and 13,8% of it was suffering ARI. While, the prevalence of passive smokers on children under-five was 56,0%, and 25,7% of it was suffering AN. Factors associated with the occurrence of ARI among children were male (OR 1,06; 95%CI 1,00-1,32), younger than 24 months (OR 1,08; 95%CI 1,02-1,15), and having low maternal education (OR 1,12; 95% CI 1,03 — 1,21). It can be concluded that the prevalence of passive smokers with AN in Indonesia is still relatively high, especially among children under-five (25,7%). This study denotes the smoking habits at home are still quite high especially in families with children under-five.