Background: Few studies dealing with the efficacy of statin therapy among patients with metabolic syndrome (MS) and coronary artery disease (CAD) have been conducted. In particular, there have been no studies of the efficacy of statins among Asian MS patients with treated CAD. Methods and Results: Data from 1,138 consecutive patients who underwent complete revascularization (coronary intervention or bypass surgery) were collected. Of these, 529 patients who satisfied the criteria for MS using the American Heart Association/National Heart, Lung and Blood Institute statement (body mass index ≥25 was used instead of waist circumference) were assessed. All-cause and cardiovascular mortality of patients given statins and those not given statins at least 2 weeks before the complete revascularization were compared. To adjust for the variables that would have been related to the decision to give statins, the propensity score was calculated, and multivariate Cox regression was carried out. Statins were given to 146 patients. During follow-up (9.1 ±2.5 years), 104 patients died. On multivariate analysis, statin use was significantly associated with reduced all-cause (hazard ratio (HR) 0.56, 0.31-0.99; P=0.049) and cardiovascular (HR 0.53, 0.30-0.96; P=0.042) mortality. Conclusions: In patients with MS and CAD, statins given at least 2 weeks before the complete revascularization, was associated with a reduced risk of all-cause and cardiovascular mortality. (Circ J 2009; 73: 2104-2109)