Patent ID: 7521361

Claim:
A method of manufacturing a wiring substrate including a first portion, a second portion, and a third portion, the third portion being positioned between the first portion and the second portion, the method comprising: forming a resist film on a substrate; patterning the resist film to form a resist portion, a first non-resist portion, and a second non-resist portion, the resist portion being positioned between the first non-resist portion and the second non-resist portion; forming a surface active film on the resist portion, the first non-resist portion, and the second non-resist portion; forming a catalyst film on the surface active film; removing the resist film together with the surface active film and the catalyst film formed on the resist portion to expose the third portion; forming a first metal film on the first portion and the second portion by dipping the substrate in an electroless plating solution; forming a water film on a surface of the third portion; and forming a second metal film on the first metal film by dipping the substrate in the electroless plating solution.