PURPOSE: To obtain the titled composition exhibiting excellent wettability and matching property when ferrite, etc., are bonded and having excellent durability of glass itself by using a composition consisting essentially of three components, Bi2O3, SiO2, and B2O3, and contg. the three components in a specified ratio.

CONSTITUTION: The composition is composed essentially of three components, Bi2O3, SiO2, and B2O3, and contains 13W30mol% Bi2O3, 30W50mol% SiO2, and 1W20mol% B2O3. In this case, the relational expressions, SiO2mol%+B2O3mol%>45mol% and SiO2mol%/B2O3mol%>2, must be satisfied. At least one kind among Li2O, Na2O, K2O, and ZnO is incorporated as the balance, and the respective contents are regulated to 1W20mol% Li2O, 1W18mol% Na2O, 1W10mol% K2O, and 1W7mol% ZnO.