PURPOSE: To mainly inspect the solderability of a baking electrode simply and accurately within a relatively short time and to support the accurate preparation of conductive paste good in electrode characteristics.

CONSTITUTION: In the inspection of the soldering aptitude of the baking electrodes 12, 12 of a chip type electronic part 10 produced by coating the terminal part of a bare chip 11 with a conductive paste composed of a mixture of a metal powder containing Ag, glass fine particles and an org. vehicle and baking the coated part, the chip type electronic part 10 is allowed to stand in gas containing a predetermined amt. of a sulfur component for a predetermined time and the baking electrodes 12, 12 are optically observed. The surface hue of the electrodes changes corresponding to the exposure degree of the Ag component.