A recent study by Shinya FUKUNAGA of Osaka University in observing bodkins of more than a thousand of mirrors including 350 of Sankakubuchi Shinjukyo Mirror showed that the shape of the bodkin of Sankakubuchi Shinjukyo Mirror was square and different from that of other mirrors which were round or semicircle.
近年、大阪大学の福永伸哉の研究により、三角縁神獣鏡350面を含む千数百面の鏡の鈕孔（ひも通し孔）の観察から、三角縁神獣鏡の鈕孔の形が長方形で、他の鏡の鈕孔の円形や半円形と異なっていることが分かった。