When ceramic electronic parts such as multilayer ceramic substrates that have a substrate body and metal wiring conductors comprising silver are manufactured, a composition comprising not only a borosilicate glass powder and a ceramic powder, but also an additive powder comprising at least one of cerium oxide, bismuth, bismuth oxide, antimony and antimony oxide is used as a composition for preparing the substrate body. Gray discoloration of the substrate body and yellow discoloration in the vicinities of the metal wiring conductors can be prevented.