Multilayer capacitor and board for mounting the same

A multilayer capacitor comprising:

• a capacitor body including first and second surfaces opposing each other in a first direction, third and fourth surfaces opposing each other in a second direction, perpendicular to the first direction, and fifth and sixth surfaces opposing each other in a third direction, perpendicular to the first direction and including a plurality of dielectric layers and first and second internal electrodes alternately disposed with the dielectric layers interposed therebetween;
• and
• first and second external electrodes disposed on the third and fourth surfaces of the capacitor body and connected to the first and second internal electrodes, respectively,
• wherein the capacitor body includes an active region in which the first and second internal electrodes overlap in the first direction, and
• at least a portion of a margin portion excluding the active region in the capacitor body includes barium (Ba) and titanium (Ti) in amounts having a molar ratio of Ba to Ti of less than 1 (Ba/Ti<1) and incudes crystal grains having a twin boundary structure.