Multilayer ceramic capacitor and circuit board

Abstract

An aspect of the present invention is a multilayer ceramic capacitor comprising: a multilayer unit obtained by alternately laminating ceramic layers and internal electrodes composed primarily of metal; a cuboid element body having a pair of covering portions arranged at both ends of the stack in the laminating direction and covering surfaces of the multilayer unit, and margin portions covering at least some of the end portions of the ceramic layers, and the end portions of the internal electrodes in the multilayer unit, and connecting the pair of covering portions to each other; and a plurality of terminal electrodes electrically connected to the internal electrodes, and arranged apart from each other on at least a mounting surface out of the surfaces forming the surfaces of the element body, wherein the mounting surface is a surface facing the circuit board on which the capacitor is to be mounted, and relational expression (1) below is satisfied, where Po is the porosity of a surface layer portion and Pi is a porosity of an inner portion located closer to the multilayer unit than the surface layer portion in at least some of the regions in the covering portion or the margin portion P i < P o . ( 1 )

Dependencies are inferred from the claim text.