Wiring circuit boards with bumps can be manufactured such that stable bump
connections are possible and plating pre-treatments or other difficult operations
are rendered unnecessary. By utilizing a technique whereby a bump-formation etching
mask 7 is formed on a bump-forming surface 3a of a metal foil
3 which has a thickness that is the sum of the thickness t1 of the
wiring circuit 1 and the height t2 of the bumps 2 which are
to be formed on the wiring circuit 1 (t1+t2), and then the
bumps 2 are formed by half-etching the metal foil 3 to a depth corresponding
to the desired bump height t2 from the bump-formation etching mask 7
side, wiring circuit boards with bumps can be manufactured such that stable bump
connections are possible and plating pre-treatments or other complex processes
are rendered unnecessary.