Dielectric ceramic and capacitor

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A dielectric ceramic includes crystal grains containing barium titanate as a main component, magnesium, a rare-earth element, and manganese, wherein the crystal grains have a cubic crystal structure; and the dielectric ceramic contains, per mole of barium, 0.033 to 0.085 mol of magnesium in terms of MgO, 0.1 to 0.2 mol of the rare-earth element (RE) in terms of RE2O3, and 0.006 to 0.018 mol of manganese in terms of MnO. Such a dielectric ceramic has a high relative dielectric constant, stable temperature characteristic of the relative dielectric constant, and no spontaneous polarization.