A 36-year-old male appeared to have an old myocardial infarction on electrocardiogram, and coronary angiography (CAG) was performed. The CAG showed total occlusions of the right coronary artery and left anterior descending artery. He was successfully treated with drug-eluting stent implantation for both occluded coronary arteries. Such serious coronary lesions are uncommon for his young age. The patient was diagnosed as having antiphospholipid syndrome (APS) based on elevation of anticardiolipin antibody and anti-β2 glycoprotein I antibody. Two years after stent implantation, the patient was well without ischemia or thrombosis. APS should be considered a potential cause of serious coronary disease in young adults.<Learning objective: Antiphospholipid syndrome (APS) should be considered a potential cause of serious coronary disease in young adults. Although there is a high risk of acute stent thrombosis and restenosis after multiple stents implantation, percutaneous coronary intervention with drug-eluting stent implantation could be an appropriate therapy for chronic total occlusion in APS patients.>