Purpose: Large scale and population-based data for pediatric out-of-hospital cardiac arrest（OHCA） are very rare. The real-world epidemiology of the younger patients’ OHCA was still unknown well. This study examined the incidence and outcomes of pediatric OHCA. Methods: This retrospective nationwide population―based cohort study included patients ＜20 years of age who experienced OHCA between January 2006 and December 2007. They were transported by emergency medical service providers who could provide only basic life support and might be underwent cardiopulmonary resuscitation and／or automatic external defibrillator shock. Results: All patients were grouped into 3 age groups: ＜1 year （infants: n＝299), 1 to 11 years (children: n＝305), and 12 to 19 years (adolescents: n＝367). The overall incidence of pediatric OHCA was 4.20 per 100 000 person-years (67.05 in infants, 2.51 in children, and 3.49 in adolescents). Survival for all pediatric OHCA was 4.9％ (2.9％ for infants, 4.7％ for children, and 7.2％ of adolescents) versus 2.6％ for adults (p＜0.0001). Unadjusted odds ratio for survival to discharge compared with adults was 1.11 （95％ confidence interval, 0.89 to 1.72） for infants, 1.34 （95％ confidence interval, 0.93 to 1.93） for children, 2.18 （95％ confidence interval, 1.64 to 2.89） for adolescents, 1.58 （95％ confidence interval, 1.31 to 1.90） for all pediatric patients. Conclusion: This study shows that the incidence of OHCA in infants was higher than the other pediatric age groups. Survival to discharge was more common among adolescents than adults.