A method for supplying solder being used for forming pad electrodes at a finer pitch and for obtaining bumps having a sufficient quantity of solder while suppressing variation. At first, a substrate (20) is placed in a liquid tank (11) filled with an inert liquid (13) while directing the surface (21) upward. Inert liquid (13) containing fine solder particles (14) is then fed from a fine particle forming unit (15) to the liquid tank (11) and the fine solder particles (14) are dropped onto the substrate (20) in the inert liquid (13) from a supply pipe (16). The fine solder particles (14) fall naturally by gravitation and reach onto the substrate (20). The fine solder particles (14) reached onto the pad electrode of the substrate (20) stay thereat gravitationally and spread on the surface ofthe pad electrode after elapsing of a solder wet time thus forming a solder film.