Patent ID: 7998560

Claim:
A multilayer ceramic substrate comprising: a laminated structure including an inner layer portion and surface portions in contact with main surfaces of the inner layer portion, the inner layer portion being arranged between the surface portions in a stacking direction; wherein the surface portions have a thermal expansion coefficient less than that of the inner layer portion; the surface portions are made of a glass-ceramic material including glass and a ceramic powder; the inner layer portion includes a conductive pattern made of an Ag-based material; the conductive pattern includes main-surface conductive films arranged on at least one of the main surfaces of the inner layer portion; at least one of the surface portions covers peripheries of the main-surface conductive films from above so as to leave central portions of the main-surface conductive films exposed and such that the peripheries of the main-surface conductive films are disposed between the at least one of the surface portions and the inner layer portion.