Patent ID: 7578058

Claim:
A production method of a multilayer ceramic substrate having a cavity, comprising the steps of: laminating a plurality of substrate green sheets including cavity formation green sheets having through holes corresponding to the cavity to form a multilayer body; laminating a shrinkage suppression green sheet piece on one of the plurality of substrate green sheets constituting a bottom of the cavity; disposing embedded green sheets separated from the cavity formation green sheets on the shrinkage suppression green sheets piece in the cavity; forming another though hole in an upper shrinkage suppression green sheet corresponding to a shape of an opening of the cavity, and fitting an embedded green sheet in the another through hole; laminating the upper shrinkage suppression green sheet with the embedded green sheet therein on an upper surface of the substrate green sheets so that the embedded green sheet in the upper shrinkage suppression green sheet is located on the embedded green sheets in the cavity, and a lower shrinkage suppression greet sheet under a lower surface of the substrate green sheets, respectively, which surfaces constitute outermost layers of the multilayer body; pressing the multilayer body; firing the pressed multilayer body so that the embedded green sheets in the cavity shrink and separate from the cavity formation green sheet; and, removing the fired embedded green sheets.