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A ceramic composition includes a glass composition and a filler including at least one of Al 2 O 3 and TiO 2 , wherein the composition of the ceramic composition includes 0.15 to 0.55 mol of a, 0.45 to 0.85 mol of b, 0.01 to 0.2 mol of an oxide RO of an alkaline earth metal element R, and 0.1 to 0.4 mol of the filler, wherein a represents a molar quantity of an oxide Ln 2 O 3 of a rare earth element Ln, b represents a molar quantity of boron oxide B 2 O 3 , and a + b = 1 mol.