Multilayer electronic component including side margin portions and method of manufacturing the same

A multilayer electronic component comprising:

• a body including a dielectric layer and an internal electrode alternately arranged in a first direction, and including an active portion in which the dielectric layer and the internal electrode overlap each other in the first direction, and cover portions respectively disposed on one surface and the other surface of the active portion in the first direction;
• external electrodes respectively disposed on one surface and the other surface of the body in a second direction, perpendicular to the first direction;
• and
• side margin portions respectively disposed on one surface and the other surface of the body in a third direction, perpendicular to the first direction and the second direction,
• wherein, in a cross-section in the first direction and the third direction, a boundary between the active portion and the cover portion is defined as an active-cover boundary, a boundary between the body and the side margin portion is defined as a first body-side margin boundary, an average distance in the first direction from the active-cover boundary to an end of the side margin portion in the first direction closest to the active-cover boundary among ends of the side margin portion in the first direction is defined as A1, an average distance in the third direction from the first body-side margin boundary to an end of the side margin portion in the third direction closest to the first body-side margin boundary among ends of the side margin portion in the third direction is defined as A2, and A1/A2 is more than 1.5 and less than 2.5, and
• in a cross-section of the multilayer electronic component in the second direction and the third direction, a boundary between the body and the side margin portion is defined as a second body-side margin boundary, an average distance in the second direction from an end in the active portion in the second direction to a surface closest to the end of the active portion in the second direction among surfaces of the body in the second direction is defined as B1, an average distance in the third direction from the second body-side margin boundary to an end of the side margin portion in the third direction closest to the second body-side margin boundary among ends of the side margin portion in the third direction is defined as B2, and B1/B2 is more than 0.35 and less than 0.55.