A dental casting billet material includes: Co as a main component Cr in a proportion of 26% by mass or more and 35% by mass or less Mo in a proportion of 5% by mass or more and 12% by mass or less and Si in a proportion of 0.3% by mass or more and 2.0% by mass or less, wherein the billet material is formed from a sintered body of a metal powder, and the billet material has a relative density of 92% or more and 99.5% or less.