To provide a sealing material comprising bismuth-based glass powder and refractory filler powder in which, while maintaining the thermal stability of the bismuth-based glass powder, the content of Bi2O3in the bismuth-based glass powder is made high, and further, the shape of the refractory filler powder is improved, thus the fluidity of the sealing material is improved, and the characteristics of a ceramic package or the like are improved.

The sealing material comprising bismuth-based glass powder and refractory filler powder is characterized in that: (1) the bismuth-based glass powder comprises, as a glass composition, by mass% expressed in terms of the below oxide, 76 to 90% Bi2O3, 2 to 12% B2O3, 1 to 20% ZnO and 0.01 to 10% CuO; (2) the content of the bismuth-based glass powder is 35 to 95 vol.%, and the content of the refractory filler powder is 5 to 65 vol%; and (3) the refractory filler powder has an almost spherical shape.

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