The present invention relates to a thin film circuit board device having
passive elements in wiring layers. The thin film circuit board device
includes a base board (2) and a circuit part (3) including insulating
layers (11) and (16) and pattern wiring (14) and (17) formed on a
build-up forming surface (2a). On the first insulating layer (11), a
receiving electrode part (21) is formed and the passive elements
electrically connected to the receiving electrode part (21) are formed.
In the circuit part (3), a substrate titanium film and a substrate film
are laminated so as to cover the receiving electrode part (21) and the
passive elements respectively. The substrate film and the substrate
titanium film in areas in which a metallic film is not formed are etched
through the metallic film serving as the first pattern wiring (14) formed
on the substrate film as a mask. Thus, a substrate layer (23) and a
substrate titanium layer (22) are formed. Consequently, the substrate
titanium film serving as the substrate titanium layer (22) prevents the
corrosion of the receiving electrode part and the respective passive
elements due to etching liquid to form the passive elements with high
performance.