Multilayer ceramic electronic device

A multilayer ceramic electronic device comprising:

• an element body comprising a dielectric layer and an electrode layer being laminated,
• wherein
• the dielectric layer comprises a main component represented by a formula ABO3, where A comprises only Ba or comprises Ba and at least one selected from the group consisting of Ca and Sr, and B comprises only Ti or comprises Ti and at least one selected from the group consisting of Zr and Hf;
• the dielectric layer comprises
• above 0 mol and less than 0.050 mol Mn oxide in terms of MnO,
• 1.00 mol or more and 2.50 mol or less Mg oxide in terms of MgO,
• 0.50 mol or more and 1.50 mol or less R oxide in terms of R2O3, where R comprises at least one selected from the group consisting of Y, Dy, Ho, Yb, Lu, Gd, and Tb, and
• 0.05 mol or more and 0.45 mol or less Zr oxide in terms of ZrO2,
• with respect to 100 mol of the main component;
• the dielectric layer further comprises Si;
• and
• the dielectric layer has a Zr/Mn ratio of 5.0 or more and 12.5 or less in atomic ratio and a Zr/Si ratio of 0.40 or more and 0.80 or less in atomic ratio.