The stent graft can be used for the treatment of coronary artery aneurysms, perforations, dissection and arteriovenous fistula. A 54-year-old man presented with progressively worsening chest pain for several months. A diagnostic coronary angiogram revealed critical stenosis with a huge aneurysmal sac (6.0x8.2 mm in size) in the proximal right coronary artery. We implanted two membrane covered stent grafts (3.0x16 mm, JoStent GraftMaster(r), JoMed, Germany) without complication. No visible coronary aneurysm or residual stenosis was demonstrated after stent grafting. A two-month follow-up coronary angiogram showed patent stent grafted right coronary artery.