Dielectric ceramic, manufacturing method thereof, and multilayer ceramic capacitor

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A dielectric ceramic includes primary crystal grains. The primary crystal grains include a composite oxide of Ti and at least one kind of alkaline earth metal element selected from Ca, Sr and Ba. The primary crystal grains contain metal compositions of Mg, Mn and a rare earth element. At least one of the metal composition of the Mg, the Mn and the rare earth element is present at a higher concentration on the surface side of the primary crystal grains than the inside thereof. A 0.04 to 0.2 parts by mass of Zr in terms of oxide to 100 parts by mass of the composite oxide is present. As a result, a high dielectric constant can be imparted even to finely granulated barium titanate based crystal grains.