In order to provide a dental prosthetic material that can improve the machinability even after obtaining the required strength without further heat treatment after machining, SiO2 is contained in an amount of 60.0% by mass or more and 80.0%. Less than mass%, Li2O is 10.0 mass% or more and 20.0 mass% or less, and Al2O3 is included by 5.1 mass% or more and 10.0 mass% or less.機械加工後にさらなる熱処理をする必要がなく、必要な強度を得た後であっても切削性を高めることができる歯科補綴物用材料を提供するため、ＳｉＯ２を６０．０質量％以上８０．０質量％以下、Ｌｉ２Ｏを１０．０質量％以上２０．０質量％以下、及びＡｌ２Ｏ３を５．１質量％以上１０．０質量％以下、で含むものとする。
