A multilayer ceramic electronic device includes an element body and external electrodes. At least one of the pair of external electrodes includes a first metal layer and a second metal layer. The first metal layer covers a part of internal electrodes and a first portion of cover dielectric layers and side margin sections which is located on a side of the internal electrodes, does not cover a second portion of the cover dielectric layers and the side margin section which is other than the first portion, contacts a part of the internal electrodes, and has a main component of nickel or copper, at a corresponding end face of the element body. The second metal layer covers the first metal layer, contacts at least a part of the second portion on a side of the first metal layer, and has a main component of tin.