Patent ID: 7909976

Claim:
A method for filling a through hole formed in a substrate with a plated metal by electrolytic plating, the method comprising steps of: starting the electrolytic plating by a high current density higher than a Constant Current Density that is capable of fully filling the through hole when the electrolytic plating is performed with a current density held constant as a current density of said electrolytic plating; and continuing the electrolytic plating by being changed to a low current density lower than the high current density after at least 0.5 hour has elapsed since the electrolytic plating was started and by the time of reaching formation of a seam diameter in which an inside diameter does not decrease even when the electrolytic plating is continued after the electrolytic plating at the high current density is started, wherein the through hole has an inside diameter of one of 30 μm, 40 μm, and 60 to 70 μm, and the range of current density between the high current density and the low current density applied during the filling of the through hole is between 0.50-1.84 A/cm 2 .