The present invention provides a method of forming a fine pattern by the post-firing method. The production method of a metallized ceramic substrate comprises: a first step of forming an organic base layer on a ceramic substrate; a second step of forming a metal paste layer on the organic base layer to produce a metallized ceramic substrate precursor; and a third step of firing the metallized ceramic substrate precursor, wherein the organic base layer is a layer which absorbs a solvent in the metal paste layer and thermally decomposes at a temperature of firing the metal paste layer.