To permit the simplification of inspection work and accurate inspection by permitting the mechanical certification of a solder material and eliminating the need for removing an oxide film on the surface of molten solder liquid.

A certifying device of solder materials comprises a large-volume solder housing tank 1 in which molten solder 3 is housed, a small-volume moving solder housing tank 5 to permit immersion in the molten solder 3 and its pumping-up, a movement control means 4 of the moving solder housing tank 5, and a supporting frame 8 with heat resistance to place a sample to support a film with good thermal conductivity. The supporting frame 8 places the film above the large-volume solder housing tank 1 at its one set location. The moving solder housing tank 5 pumps up the molten solder 3 in the large-volume solder housing tank 1 by the movement control means 4 to elevate the liquid level of the molten solder 3 to a location in contact with the film and make the heat of the molten solder transferred to a sample via the film to fuse the sample to perform the certification of characteristics.