Multilayer electronic component

A multilayer electronic component comprising:

• an effective portion including dielectric layers and internal electrodes alternately laminated in a laminating direction;
• a cover, superposed on the effective portion from a first side out of the first side and a second side in the laminating direction, and including:
• two or more insulating layers laminated in the laminating direction, and
• a dummy electrode positioned at boundaries of the two or more insulating layers;
• an underlying electrode superposed on the cover from the first side;
• and
• an external electrode superposed on the underlying electrode from the first side,
• wherein the underlying electrode and the external electrode are secured by sharing a diffusion layer in which a material of the underlying electrode and a material of the external electrode coexist with each other,
• wherein a first edge portion of each of the internal electrodes and the external electrode are in contact with each other,
• wherein a second edge portion of the dummy electrode and the external electrode are in contact with each other, and
• wherein a length of a portion in which the material of the external electrode is diffused in the internal electrode at greater than or equal to 12.5 atom %, the length being from the first edge portion is smaller than a length of a portion in which the material of the external electrode is diffused in the dummy electrode at greater than or equal to 12.5 atom %, the length being from the second edge portion.