In this study, we verified the relationship among the electrical conductivity, chemical durability, and structure of conductive vanadate glass in which BO 3 and BO 4 and V 4+ and V 5+ coexist simultaneously. We prepared samples of vanadium borophosphate glass with various compositions, given by, and analyzed the electrical conductivity, chemical durability, FT-IR spectroscopy, thermal properties, density, and molar volume. Substituting B 2 O 3 for P 2 O 5 was found to improve the electrical conductivity, chemical durability, and thermal properties. From these results, we can draw the following conclusions. First, the electrons shift from the electron rich V 4+ to the electron deficient BO 3 as the B 2 O 3 content increases. Second, the improvement in chemical durability and thermal properties is attributed to an increase in cross-linked structures by changing from a BO 3 structure to a BO 4 structure.