Heat-insulating member, low-melting glass composition, and sealing material paste

A heat-insulating member comprising:

• a pair of substrates;
• and
• an airtight sealing part,
• wherein the airtight sealing part is formed in an outer peripheral part between the pair of substrates, a space being formed between the pair of substrates, the space being in a vacuum or reduced pressure state,
• a sealing material that forms the airtight sealing part includes a low-melting glass composition comprising:
• vanadium oxide;
• barium oxide;
• phosphorus oxide;
• tungsten oxide;
• and
• at least one additional oxide selected from the group consisting of TeO2, SrO, ZnO, K2O and Na2O,
• wherein the low-melting glass composition contains, in terms of oxide contents, 35 to 47 mol % of V2O5, in which the following relational expressions are satisfied:
• the mol % of V2O5+the mol % of BaO+the mol % of P2O5+the mol % of WO3≥90 mol %;
• and
• the mol % of V2O5>the mol % of BaO>the mol % of P2O5>the mol % of WO3.