Multilayer ceramic capacitor

A multilayer ceramic capacitor comprising:

• a base body including a first main surface and a second main surface opposed to each other in a thickness direction, a first side surface and a second side surface opposed to each other in a width direction, a first end surface and a second end surface opposed to each other in a length direction, and a plurality of dielectric layers and a plurality of internal electrode layers laminated in the thickness direction;
• and
• a pair of external electrodes respectively at the first end surface and the second end surface, and electrically connected to the plurality of internal electrode layers;
• wherein
• when the base body is divided into an inner layer defined by an internal electrode layer closest to the first main surface and an internal electrode layer closest to the second main surface among the plurality of internal electrode layers, a first outer layer defined by the inner layer and the first main surface, a second outer layer defined by the inner layer and the second main surface, a first side margin portion defined by the inner layer, the first outer layer, the second outer layer, and the first side surface, and a second side margin portion defined by the inner layer, the first outer layer, the second outer layer, and the second side surface, the dielectric layers in each of the inner layer, the first outer layer, and the second outer layer include main crystal grains including barium and titanium, and the dielectric layers in each of the inner layer, the first outer layer, and the second outer layer further include, with respect to 100 parts by mol of titanium, nickel in an amount of about 0.2 parts by mol or more and about 3.0 parts by mol or less, and at least one rare earth element selected from yttrium, praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, and lutetium in an amount of about 0.6 parts by mol or more and about 2.0 parts by mol or less;
• and
• when an inner region is defined as a region surrounded by planes spaced inward by about 50 μm from an interface at which each of the first outer layer, the second outer layer, the first side margin portion, and the second side margin portion is in contact with the inner layer, a magnesium content with respect to 100 parts by mol of titanium is about 0.05 parts by mol or less in the dielectric layers in the inner region.