A mixed raw material for a silicate glass, capable of suppressing the development of a heterogeneous layer on the surface of a glass melt, and a method for manufacturing a tube glass using the same are provided.A mixed raw material for a glass of the present invention is a mixed raw material for a silicate glass, including at least a silica sand and a feldspar, in which with respect to the silica glass, a D50 value is 100 µm or more and 300 µm or less, the uniformity represented by a value obtained by dividing a D60 value by a D10 value is less than 2.0, and with respect to the feldspar, a D50 value of is 100 µm or more and 400 µm or less, and the uniformity represented by a value obtained by dividing a D60 value by a D10 value is 1.5 or more and less than 4.0. The mixed raw material for a silicate glass is melted and formed into a tube shape.
