In a multilayer ceramic electronic component, dummy electrodes are located in margin regions. In a region between an extension line of a side of a facing portion of an internal electrode facing a side surface of an element body and a side of an extending portion of the internal electrode facing the side surface, the dummy electrode is arranged not to extend to the extension line of the side facing the side surface. The dummy electrode includes a plurality of electrode pieces linearly extending in the direction parallel or substantially parallel to the side surface.